Fluidmaster 385 Replacement Cap Assembly for 400A Fill Valves. Go to amazon.com Related posts 11 best 400a fill valve for 2022 Top 9 best fluidmaster 400a valve Top 13 best fluidmaster fill valve FeatureManufactured in chinaEasy to useHighly durableIncludes sealEasily installs onto fill valveFixes leaks at cap1 year warranty DescriptionReplacement cap for all Fluidmaster 400 series fill valves.