Since the Hypro 9910-GS40GI regulator shares the same specifications as the AR GIC40 Regulator, with the exception of the seat material (GS40GI uses a viton valve seat, while the GIC40 uses a ceramic valve seat), it can be used on the Annovi Reverberi AR 30, AR 40, AR 50, AR 303, AR 403, AR 503 diaphragm pumps. Both regulators are interchangeable with one another.
