Check Valve Set of 12

High quality medical grade check valve.
Checkvalves are used when building hydrogen generators. (also used with fish tanks and medical equipment)
The purpose of a check valve is for safety reasons. It is to keep dangerous amounts of HHO gas from building too much pressure inside your generator. In normal operation it is inactive. It's a "check valve" - it will allow air/liquid flow in one direction but not the other. In our application, we glue it on top of the device POINTING UPWARD. It will let air (or HHO) go OUT but not in. Why? In normal operation the engine sucks all the HHO out of the device, and also causes this check valve to be continually closed. Just in case the engine stops doing that (no vacuum), or for some reason there is blockage of the output hose, we DO NOT WANT PRESSURE BUILDUP inside the device, because the HHO might explode. If pressure starts to build up inside (when water expands into gas) the Pressure Release Valve will release the pressure into the atmosphere (once HHO mixes with air, it will not be explosive any more). When you build the device, then, make sure the check valve, points outward. Both ends must be open.
Specifications
.124 inch OD, .142 psi 1 1/8” long, ½” wide