PRESSURE RELIEF PSI TESTING TOOLS. A must for any engine builder. Bench test cam plate before installation, set and seal relief valve, set spring pressure to desired pop-off psi; Feuling® recommends the cam plate valve be seated 0-30 psi with full pop off at 55-60 psi. Includes regulator, 0-100 psi pressure gauge, gasket and necessary hardware. Made in the U.S.A. - Part Number - 3801-0071