Hollow stopper has a 1/4in ceramic ball check valve contained within the hollow portion of the stopper. The valve remains closed until pressure from within the vessel builds up and pushes the ceramic ball from its seat.

Item Number	Item Description	PQ
CG-3007-01	Stopper, Pressure Release, 24/40	EACH
CG-3007-02	Stopper, Pressure Release, 29/42	EACH