John Guest 12 mm Push-Fit Single Check Valve – Non‑Return Valve (12SCV), Caravan/RV Plumbing

Prevent unwanted water backflow in your caravan, RV, or marine plumbing system with the John Guest 12 mm Single Check Valve (Model 12SCV). This genuine acetal, push-fit valve ensures one-way fluid flow with low head loss, fast tool-free installation, and reliable performance under high pressure and temperature cycles.

Key Features & Specifications:

• One-Way Valve for 12 mm Tubing: Allows water flow in a single direction to prevent reverse flow and siphoning. 

• Performance Ratings:

  • Up to 10 bar at 20 °C

  • 7 bar intermittent use up to 65 °C

  • Functions reliably in a temperature range down to 1 °C

  • Opens at a low pressure of ~0.02 bar 

   

• Material & Build: Rugged acetal copolymer with nitrile O-ring—robust, food-safe, and compatible with potable water systems. 

• Easy Push-Fit Installation: Connects instantly and securely with a push-fit design—no tools or sealants needed; easily removable for maintenance. 

• Low Headloss & Durable Design: Engineered to minimise flow restriction; suitable for liquids (not air/vacuum) and designed for longevity. 

• British Quality: UK manufactured, part of the John Guest Hangsell range; typically includes a 1-year supplier warranty.