Cartridge Valve - "S1", "S3", "S4", "S6", "S7", "S8" fits Meyer E-72, V-71, Home Plow by Meyer. It is the "A" Cartridge on the Meyer E-72 (and the A on the E-58H with plastic Coils). Photo is Home Plow by Meyer Power Angling Unit. See additional Images for V-71, E-72.