3psi one way check valves
3psi one way check valves
3psi one way check valves
3psi one way check valves
3psi one way check valves
3psi one way check valves
3psi one way check valves
3psi one way check valves

3psi one way check valves

3psi one way check valve

$29.99

Running an open system without pressure and losing coolant?

Well slip this in the overflow tube and voilà; you have mild pressure to keep the fluid in your system. 

In an non pressure system the fluid evacuates due to:

  • excess coolant
  • thermal expansion 
  • excessive flow from higher speeds 
  • blocked and clogged tubes 
  • water pump impeller design flaws

This handy dandy little check valve will not suck back but it is a great tool for keeping the fluid in for longer.


We make to order. Please allow adequate time for us to build.

Build time estimates [late May 2025]

Model Ts Brass/Black [Our foundry has resumed production and we have begun shipping Model Ts.  We will update the lead times asap]

Model As 9-11 weeks

Heater cores ~6 weeks

Model A and 32 Ford Street rods 6 weeks

Common street rods ~10-13 weeks

Tricky customs & complicated restorations ~16 weeks

We appreciate your patience as we continue to recruit and train new fabricators and manage the labor shortfall our country has been experiencing.