duotight - 6.3mm (1/4”) Female x 6.3mm (1/4”) Female One Way Check Valve (Gas/Water)

This very handy fitting could save your regulator and is a worthwhile, long-term investment for any setup. By preventing backflow, it acts as a critical line of defence against liquid travelling backward into delicate gas equipment, protecting your regulator from potential contamination and expensive fluid damage.

This particular type of check valve is engineered with a very low opening cracking pressure of only 1 psi, ensuring fluid or gas flows freely with minimal resistance and system restriction. Highly versatile in application, this check valve is suitable for clean liquids such as water as well as a wide range of gases. Furthermore, the internal spring and essential components are crafted from high-grade stainless steel, providing outstanding durability, corrosion resistance, and reliable performance even under continuous operational use.

Applications & Compatibility

• Gas line: Prevents any liquid from flowing back into your regulator
  
• Liquid line: Prevents liquid backflow

6.35mm Tubing Compatibility

This 6.35mm duotight fitting is optimised for use with EVABarrier Dual Barrier Line. It is compatible with:

• KL25331 : 3mm ID x 6.35mm OD | 12m
• KL42758 : 3mm ID x 6.35mm OD | 12m (Red)
• KL42789: 3mm ID x 6.35mm OD | 12m (Black Lightshield)
• KL42758 : 3mm ID x 6.35mm OD | 12m (PE Water Line)

The duotight Generation 2 Difference

Why settle for standard push-in fittings? duotight Generation 2 represents a massive leap in engineering over traditional acetal fittings.

Dual-Material Double O-Ring Design

The secret to our superior seal is a two-stage system using two different high-quality materials:

1. EPDM O-Ring: Provides exceptional chemical and gas resistance.
2. Silicone O-Ring: Maintains its shape and elasticity in sub-zero temperatures.

High-Performance Materials (POK)

Instead of standard Acetal, Generation 2 fittings are made from Polyketone (POK).

• Higher Chemical Resistance: Withstands harsh brewery cleaners.
• UV Protection: Won't become brittle over time.
• Extreme Durability: Rated for over 300psi @ 25°C.

User-Friendly Features

• Color-Coded Collets: Green denotes 6.35mm (1/4").
• Depth Indicators: Includes >| |< indicators so you know the hose is fully seated.
• No Clamps Necessary: Simply push to seal; push the collet to release.

We recommend using a Tube Cutter to ensure a perfectly straight, burr-free cut. An angled cut is the #1 cause of leaks in push-fit systems.