Korky makes the toilet-repair parts plumbers keep on the truck — fill valves, flappers, flush valves, and the adjustable and universal kits that fit most American toilets. The QuietFILL platform is the quieter alternative to older ballcock-style valves, and the chlorine-resistant rubber outlasts generic flappers two-to-one.
The 528X is Korky’s 2X Long Life QuietFILL fill valve — rated for twice the service life of a standard valve thanks to a chlorine-resistant seal. Adjusts from 7.75 to 13.5 inches to fit most toilet tanks, refills 30% faster than older ballcock valves, and runs dead quiet. Drop-in replacement with no tools beyond a wrench.
Korky is a brand of Lavelle Industries, a family-owned Wisconsin manufacturer that has been producing toilet-repair parts since 1957. Fill valves and flappers are molded and assembled in American facilities, and the brand is known in the plumbing trade as the go-to replacement for warranty-grade repairs.