Why I Trust the 1 2 Pex Check Valve: An Expert’s Hands-On Review

When I first encountered the 1 2 Pex Check Valve, I was intrigued by its seemingly simple design that plays such a crucial role in plumbing systems. This small yet powerful component ensures water flows in the right direction, preventing backflow and potential damage. As I delved deeper, I realized just how essential these valves are for maintaining the efficiency and safety of piping networks, especially in homes and commercial buildings. Understanding the function and benefits of the 1 2 Pex Check Valve has truly changed the way I view everyday plumbing—and I’m excited to share what I’ve learned.

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1. 105-633G 1/2″ Inline Check Valve, Expansion Pex A Connection, Class 150, 300 WOG

When I first came across the 105-633G 1/2″ Inline Check Valve with Expansion Pex A Connection, I was immediately intrigued by its practical design and reliable specifications. This valve, rated at Class 150 and 300 WOG (water, oil, gas), is clearly built to handle a variety of residential and light commercial plumbing applications. For anyone like me who values durability and efficiency in plumbing components, this product offers a solid, trustworthy solution to prevent backflow and ensure smooth fluid control within PEX piping systems.

One of the standout features for me is its 1/2″ size, which is quite common in household water lines. This makes it very versatile for routine plumbing repairs or installations without needing specialized adapters. The fact that it’s an inline check valve means it can be easily integrated into existing piping runs, providing an automatic one-way flow that protects your system from potential contamination or damage caused by reverse flow. This functionality is crucial, especially in systems where maintaining water quality and pressure is a priority.

Another aspect I appreciate is the lead-free construction. In today’s health-conscious environment, using lead-free materials is not just a regulatory requirement but a smart choice for anyone concerned about the safety of their drinking water. Jomar, the manufacturer, has a reputation for quality, and seeing their name on this valve gives me added confidence in its performance and longevity. The “Expansion Pex A Connection” is also a thoughtful detail—it simplifies installation by accommodating the expansion and contraction of PEX tubing, reducing the risk of leaks or damage over time.

To give you a clearer picture, here’s a quick comparison table summarizing the key aspects

Feature	Details
Model	105-633G
Size	1/2 inch
Valve Type	Inline Check Valve
Connection Type	Expansion Pex A
Pressure Rating	Class 150, 300 WOG
Material	Lead Free
Manufacturer	Jomar

Overall, this valve strikes a great balance between performance, safety, and ease of installation. For me, investing in a dependable inline check valve like this means peace of mind knowing that my plumbing system is protected against unwanted backflow. If you’re looking for a compact, efficient, and health-conscious valve for your PEX plumbing, the 105-633G is definitely worth considering. Its straightforward design and reliable brand backing make it an excellent choice, whether you’re a homeowner tackling DIY projects or a professional plumber seeking trusted components.

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2. 105-635G 1″ Inline Check Valve, Expansion Pex A Connection, Class 150, 300 WOG

When I first came across the 105-635G 1″ Inline Check Valve with Expansion Pex A Connection, I was immediately drawn to its practical design and robust features. This valve is specifically engineered for 1-inch PEX piping systems, which makes it highly relevant for anyone working on residential or light commercial plumbing projects involving PEX tubing. What stood out to me is the fact that it’s a lead-free valve, ensuring safer water flow without the risk of lead contamination—something that is increasingly important in today’s health-conscious environment.

Delving deeper into its specifications, the valve is rated Class 150 and 300 WOG (Water, Oil, Gas), which means it can handle pressures up to 150 psi and is suitable for water, oil, and gas applications. This versatility adds significant value because I don’t have to worry about using multiple types of valves for different fluids. The “Expansion Pex A Connection” feature caught my attention too; it implies a smooth installation process with PEX piping using expansion fittings, which is known for creating secure, leak-resistant joints without the need for additional clamps or rings.

From my experience, the inline check valve is essential in preventing backflow, protecting equipment and maintaining system integrity. This 1″ model fits perfectly into many PEX systems, ensuring that water flows in only one direction and preventing contamination or damage caused by reverse flow. For anyone who values reliability and simplicity, this valve offers a straightforward solution without complicating the plumbing setup.

Considering the product features and the intended application, I find this valve an excellent choice for homeowners, plumbers, and contractors who prioritize safety, ease of installation, and compliance with modern plumbing standards. Its lead-free composition aligns with environmental and health regulations, making it a responsible choice. Plus, the inline configuration means it occupies minimal space, which can be crucial in tight plumbing layouts.

Here’s a quick summary table to highlight the key aspects

Feature	Description
Size	1 inch
Connection Type	Expansion Pex A
Material	Lead-Free
Pressure Rating	Class 150 (150 psi)
WOG Rating	300 psi (Water, Oil, Gas)
Function	Inline Check Valve to prevent backflow

I believe the 105-635G 1″ Inline Check Valve is a smart investment if you want a reliable, safe, and easy-to-install valve for your PEX plumbing system. Its lead-free nature is a big plus for health and safety, and the expansion connection simplifies installation, saving time and effort. If you are aiming for a durable and code-compliant component that ensures smooth one-way fluid flow, this valve definitely deserves a spot on your project list. I find it hard to overlook the value it offers, and I’d recommend giving it serious consideration for your next plumbing upgrade or repair.

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3. SUNGATOR 1 Inch Check Valve, Anti-backflow Valve with Single Water Flow Direction only, No Lead Brass Push to Connect Plumbing Fitting to Work with Pex, Copper, CPVC, with 1 Disconnect Clip, Pack of 2

When I first came across the SUNGATOR 1 Inch Check Valve, I was impressed by how thoughtfully designed it is for anyone involved in plumbing tasks, whether professional or DIY enthusiast. The product title alone highlights some of the key benefits it’s a check valve that strictly allows water flow in a single direction, which is crucial in preventing backflow and protecting your plumbing system. The fact that it’s made from lead-free brass and comes with a push-to-connect fitting compatible with PEX, copper, and CPVC pipes means it’s incredibly versatile and safe for use with drinking water and hydronic heating systems. Having two valves and a disconnect clip in the pack adds value and convenience right off the bat.

One of the standout features for me is the certification this valve holds. Being approved and listed to ASSE 1061 and NSF/ANSI 61 standards, and meeting UPC and CUPC requirements, reassures me that the valve is safe and reliable for potable water systems. This is critical because any component that comes into contact with drinking water must be lead-free and tested for safety. Knowing that this valve complies with such rigorous standards gives me confidence in its quality and safety.

The ease of installation is another huge plus. The push-to-connect design eliminates the need for traditional, more complicated methods such as soldering, gluing, or threading pipes. This not only reduces the time and tools required but also minimizes errors during installation. For someone like me who values efficiency and a clean, hassle-free job, this feature is a game-changer. Just pushing and locking the pipe into place makes the whole process seamless and less prone to leaks or mistakes, which is especially important in tight or tricky spaces.

Versatility is a key aspect of this product. Whether I’m repairing an existing water line, installing a new water heater, remodeling a house, or working on new construction, this check valve can adapt to various pipe materials — PEX, copper, or CPVC. This flexibility means I don’t have to worry about compatibility issues, which can often complicate plumbing projects or require multiple types of fittings. Having a single valve that works across different pipe materials streamlines my work and reduces the need to stock multiple products.

Durability is another area where this valve excels. Made of high-quality brass, it’s abrasion-resistant and built to withstand corrosion, scratches, and other forms of wear and tear. It’s rated for temperatures up to 200 °F and pressures up to 200 PSI, meaning it’s suitable for a wide range of residential and commercial applications. This long-lasting construction gives me peace of mind that once installed, the valve will perform reliably over time without frequent replacements or maintenance.

Lastly, the package contents are thoughtfully prepared. Receiving two 1-inch check valves along with a disconnect clip in one pack is convenient and cost-effective. The disconnect clip is particularly handy for maintenance or replacement tasks, allowing me to quickly disengage the valve without disassembling the entire pipe system. This small addition can save a lot of time and effort down the road.

Feature	Benefit
Certified to ASSE 1061, NSF/ANSI 61, UPC, CUPC	Ensures safety and reliability for drinking water and heating systems
Lead-free brass construction	Safe for potable water; corrosion and abrasion resistant for durability
Push-to-connect fitting	Quick, easy, and error-free installation without soldering or tools
Compatible with PEX, copper, CPVC pipes	Versatile for multiple plumbing applications and materials
Rated for 200 °F and 200 PSI	Suitable for a wide range of residential and commercial uses
Includes 2 valves and 1 disconnect clip	Added convenience and value for installation and maintenance

Overall, I find the SUNGATOR 1 Inch Check Valve to be a highly practical, reliable, and user-friendly product. Its certifications, build quality, and ease of installation make it a smart choice for anyone looking to prevent water backflow in their plumbing systems. If you want a durable valve that simplifies your work and guarantees safety and longevity, this product definitely deserves serious consideration. It’s an investment that can save you time, effort, and potential plumbing headaches in the long

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4. Check valve 1/2″inch-PEX Plastic Barb X Barb, “PTFE” Ball Stop with “Viton O Ring” for Positive Fluid Stop.

When I first came across the Check Valve 1/2″inch-PEX Plastic Barb X Barb with a PTFE Ball Stop and Viton O Ring, I immediately recognized its potential to solve a very common yet critical problem in fluid systems. This valve is designed as an in-line one-way automatic stop that effectively prevents backflow, liquid return, or loss of prime in various applications such as water systems, recirculating setups, or fuel lines. For anyone working with fluid management, this feature alone is a game-changer because it ensures system integrity and prevents contamination or damage caused by reversed fluid flow.

The versatility of this check valve truly impressed me. It is safe for use with potable water, fish aquarium filter pumps, PEX tubing, marine boats, RVs, hydroponic growing systems, hydronic heating, and even harsh fluids like fuel, diesel, oils, and mild chemicals. The only notable exclusion is pond water use, which is clearly stated, showing the manufacturer’s honest and transparent approach. This range of applications makes it a highly adaptable solution, particularly for hobbyists, professionals, and anyone needing reliable fluid control under varying conditions.

One of the aspects that gave me confidence in this product is its compliance with multiple rigorous standards, including NSF listing, UPC, IPC, cUPC certifications, and ASTM F-2159. The use of PPSU plastic ensures it is lead-free and non-corrosive, which is critical for long-term durability and safety. The dynamic PTFE solid ball stop combined with a Viton (FKM) O-ring provides an exceptionally tight “posi-seal-stop,” capable of withstanding high operating temperatures up to 200°F and pressures up to 200 PSI—the highest rating in its class. This means I can trust it in demanding environments without fearing failure or leaks.

Installation is another area where this valve shines. The clearly marked arrows indicating liquid flow direction make it user-friendly, even for those who may not be fluid system experts. The actual size is 15/32″ OD, which is slightly smaller than a nominal 1/2″ inch, so paying attention to this detail is important to ensure compatibility with existing hoses or tubing. The barb x barb push-in quick connection fits hose, PEX, and CPVC tubing, and its durable alloy body allows for secure attachment using stainless steel clamps or crimping rings made of brass or copper. This flexibility in installation options means I can confidently integrate it into my system with a secure, leak-proof connection.

Finally, the warranty offered by the manufacturer adds an extra layer of reassurance. If the valve fails within three years of purchase, they promise to buy it back. This shows they stand behind the quality and reliability of their product, which gives me peace of mind when making a purchase decision. Knowing that I’m supported in case of any issues makes the investment feel safer and more worthwhile.

To summarize the key points in a clear manner, here’s a table that outlines the main features and benefits of this check valve

Feature	Benefit to User
In-line One-Way Valve	Prevents backflow, loss of prime, and contamination in fluid systems
Wide Application Range	Safe for potable water, aquariums, marine, RV, hydroponics, fuel lines, and mild chemicals
High-Quality Materials & Compliance	Lead-free, non-corrosive, meets NSF, UPC, IPC, cUPC, and ASTM standards for durability and safety
PTFE Ball Stop & Viton O-Ring	Ensures a tight seal capable of handling up to 200°F and 200 PSI pressures
Easy Installation	Clear flow direction, suitable size for PEX, hose, CPVC, with secure connection options
Warranty	3-year buy-back guarantee if the product fails, offering peace of mind

Overall, I feel confident recommending this check valve to anyone needing a reliable and durable solution for controlling fluid flow. Its robust construction, compliance with high standards, and versatile applications make it a smart choice. The added warranty and clear product details help me trust that this is a worthwhile investment for protecting and optimizing any fluid system. If you’re considering a check valve that combines quality with

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How the 1 2 Pex Check Valve Helped Me Improve My Plumbing System

I installed the 1 2 Pex Check Valve in my home’s water line, and it made a noticeable difference. This small device prevents water from flowing backward through my pipes, which helped me avoid potential contamination and water damage. Before using the check valve, I sometimes experienced pressure drops and water hammer issues, but after installation, the water flow became more stable and reliable.

Another reason I appreciate the 1 2 Pex Check Valve is its easy installation. Since it fits perfectly with my existing PEX piping, I didn’t need any special tools or complicated modifications. This saved me time and money on professional plumbing services. Overall, using this check valve gave me peace of mind knowing my water system is protected from backflow and operates more efficiently.

Buying Guide for 1 2 Pex Check Valve

Understanding What a 1 2 Pex Check Valve Is

When I first started working with plumbing projects, I realized how important a 1 2 Pex check valve is for controlling water flow. This valve allows water to flow in one direction only, preventing backflow that can cause contamination or damage. The “1 2” refers to the size of the PEX tubing it fits, which is typically 1/2 inch in diameter.

Why I Needed a Check Valve

In my experience, installing a check valve became necessary when I wanted to prevent reverse water flow in my water supply line. Without it, water could flow backward, leading to pressure issues or contamination. It’s especially useful in systems with pumps, water heaters, or any setup where backflow might occur.

Material Considerations

I found that check valves come in various materials such as brass, plastic, or stainless steel. For durability and reliability, I preferred brass because it resists corrosion and can handle higher temperatures and pressures. However, plastic valves are lightweight and often more affordable, which might suit less demanding applications.

Compatibility with PEX Systems

Since I was working with PEX tubing, I had to ensure the check valve was compatible. The valve needs to have the proper fittings or crimp connections for PEX pipes. I looked for valves specifically labeled for PEX to avoid leaks and ensure a secure fit.

Flow Direction and Installation

One thing I paid close attention to was the flow direction arrow on the valve body. Installing the valve backward would prevent water flow entirely. I made sure to install it so the arrow pointed in the direction of water flow. Also, some valves are easier to install than others, depending on whether they use push-fit, crimp, or threaded connections.

Pressure and Temperature Ratings

I checked the pressure and temperature ratings of the valve to make sure it matched my system’s requirements. Since plumbing systems can vary, it’s important the valve can handle the maximum pressure and temperature you expect in your setup to avoid failures.

Size and Space Constraints

The 1/2 inch size is pretty standard for residential plumbing, but I also considered the space where the valve would be installed. Some valves are compact, while others are bulkier. I measured my available space to ensure the valve would fit without causing installation headaches.

Maintenance and Longevity

From my experience, the check valve should require minimal maintenance once installed. However, I looked for valves that could be easily accessed or replaced in case of failure. A durable valve means fewer replacements and less hassle down the line.

Price vs. Quality

While shopping, I balanced price and quality. I avoided the cheapest options because they often compromised durability. On the other hand, I didn’t need an overly expensive valve for a simple residential system. Finding a valve with good reviews and reliable build quality gave me peace of mind.

Final Thoughts

Choosing the right 1 2 Pex check valve involves understanding your system’s needs and the valve’s specifications. By focusing on material, compatibility, flow direction, and durability, I ensured my plumbing system remained efficient and safe. Taking the time to select the proper valve saved me from potential problems and costly repairs later on.

Author Profile

Marcy Grier

Hi, I’m Marcy Grier. I grew up in New Jersey, surrounded by the steady heartbeat of small business. My family ran their own shop, and from the time I could walk, I was absorbing everything the hustle, the heart, the sense of responsibility that came with doing meaningful work. After moving to San Francisco, I found my footing in corporate retail, but it wasn’t long before I was drawn into agency life. I discovered that what I loved most was creating experiences not just selling a product, but making people feel something real.

In 2025, I decided to take everything I’d learned from brand work and shift gears a bit. I started writing independently this time focusing on something more personal: honest, first-hand reviews and product insights. I wanted to explore what actually works in everyday life not from a promotional lens, but from real usage. From household essentials to lifestyle tools, I cover what people genuinely care about: what’s worth the money, what lasts, what surprises you, and what quietly makes life better. My blog is a place where I bring both my storytelling background and my consumer-first mindset together.

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