1975 – 1978 GM Truck – C, K Series 30, 1 Ton with dual rear wheels
1975 – 1978 GM Truck – G Van Series 30, 1 Ton with dual rear wheels & Dana Axle
1975 – 1978 GM Truck – P Step Van Series 30, 1 Ton with dual rear wheels (EX 11,000# axle)
1975 – 1978 GM Truck – Motor Home Chassis JB-8 with dual rear wheels (EX Dana Axle)
1979 – 1985 GM Truck – GP3 1 Ton with dual rear wheels
1984 – 1990 GM Truck – G3 1 Ton with dual rear wheels (RO5)
1987 – 1991 GM Truck – RV3 1 Ton with dual rear wheels

NOTE: May fit other models.

This pump has the old style multi-layer diaphragm.
Made in USA
Manufactured by GM
Group # 5.812 & 19.0460 Part # 355815
Measurements: 9/16 – 18 x 13-16″