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Piston Pump Repair Kit (Models 425,435) Includes: O-rings (0062291, 0062139, 0062140, 0062258); viton collar (4400189); valve plate (4061257 x 2); spring (0070260); and seal plug (4074350).
Viton Collar on my old backpack sprayer became deformed after many years of hard use, but was able to restore sprayer to new working condition with this little kit, replacing o-rings, spring, seals, etc. as well as collar, & using Vasoline to lubricate.
Glad you're back in business and were able to refurb your sprayer - thanks for shopping with us!