Description NOS Windshield Washer Piston 4918790 This is a NOS washer pump piston assembly. Consists of piston, housing and shaft, in the original off white color. From the 60s into the 70s Gm used these on many different applications. Some we have found required using the shaft from the existing pump, easily changed. You need this if the piston, or seal is bad, you have a black replacement part, or your housing is cracked or bad. This design was used when GM no longer used the rubber bellows (we manufacture them and have them in our other listings) These were also used on various other GM products around the same years. GTO, Olds 442, Pontiacs, Chevelle, Camaro, Firebird, etc. This part is not used with the 5 port pump on 70 to early 71 Corvette! Remember, we ship orders of $40 or more FREE to the 48 contiguous United States!
