Also this check can be used as a port check valve which can be adjusted to a set pressure to regulate when the port nozzles come on.
The hi-speed check has both ends male 37 degree JIC as the port check is 37 degree JIC on one end and ORB on the other.
Please specify port or hi speed check and spring pressure when ordering and if your not sure let RBS help you.
Hi-speed version uses 7/16-20 thread in Enderle or Crawford jets.
Racer can choose check valve type from drop down menu.