https://www.mccoys.com/shop/p/6339964-052303-30/solo-0610407-k-pump-repair-kit-piston
Repair kit for Solo backpack sprayers with piston pump. Fits 425, 425-Deluxe, 435, 473-P.
Type
Piston
Suitable for
425, 425-101, 425-Deluxe, 435 and 473-P All Solo Backpack Piston Pump Sprayers
Includes
Viton Collar, Valve Plates, O-Rings, Spring and Seal Plug