Better product description needed-check values do not hold-they leak back
The check valves do not hold when installed properly in the correct flow direction, they leak.
The product should list a verified PSI for the check valve.
The application was used for an Ozone feed into the suction side of a water pump.
The check valves do not hold the back pressure, and leak air causing the pump to lose prime.
May be great for some applications, but certainly failed as a check valve in this application.