The John Guest Inline Tube Check Valve Quick Connect Fitting prevents backflow in your water system with push-to-connect convenience and industry-proven reliability. Engineered with acetal copolymer construction and NSF 51 & 61 certification, this valve delivers low headloss performance with a crack-open pressure of just 0.02 Bar.
SPECIFICATIONS
Technical Details
| Manufacturer | John Guest |
| Material | Acetal copolymer with Nitrile O-rings |
| Maximum Pressure | 10 Bar at 20°C, 7 Bar at 65°C (intermittent hot water) |
| Minimum Temperature | 1°C |
| Crack Open Pressure | 0.02 Bar (approximately 0.3 psi) |
| Certifications | NSF 51 & 61, FDA approved materials |
| Connection Type | Quick connect push-fit |
| Application | Liquids only, not suitable for air or vacuum |
INSTALLATION & USE
How to Install
- Ensure tubing is cut square and clean, with no burrs or deformation
- Push tubing firmly into the John Guest fitting until it bottoms out against the internal tube stop
- Verify correct flow direction by checking the arrow marking on the valve body
- Test for leaks by pressurizing the system gradually and inspecting all connections
COMPATIBILITY
System Requirements
This check valve is compatible with all standard John Guest tubing sizes and quick connect fittings. Originally developed for the drinks dispense industry, it works with reverse osmosis systems, water filtration equipment, ice makers, beverage dispensers, and any liquid handling application requiring backflow prevention. Not suitable for compressed air, vacuum lines, or gas applications.
🔧 Always install check valves with the flow direction arrow pointing away from your water source and toward the dispense point. Installing backwards will prevent flow entirely.
