Spirng discharge type ; 1 in. Or 0.500 in. Or 0.500 in. Stroke setting; 5.0 cc per 1 in. Stroke 2.5 cc per 0.500 in. Stroke; 0.656 in. Piston dia; 60 psi discharge pressure; 6 in. Lg; mounting flange 2.000 in. By 2.750 in. With 4 mounting holes 1.250 in. C to c by 2.000 in. C to c