[martin417]

Originally Posted by AllenGregoryIV

A quick exhaust valve is however a check valve so it must be used in a way that the system is able to satisfy R89.



Another useful item that AutomationDirect sales that not enough teams use is 1/4" push connect plugs.
Very useful for closing off solenoids and things. Much easier then using a T fitting and a loop of tube like some teams do.

It's only a check valve if you plug the exhaust port. You could also plug any other port on the system and violate the rules by trapping air.