Fluidmaster Fill Valve 400 Model: 400A Fit and Fixes
The Fluidmaster 400 model is an adjustable, anti-siphon toilet tank fill valve, with the 400A as the standard black-cap version. It replaces many older ballcock assemblies, refills both the tank and bowl, and shuts off through a float-controlled diaphragm. The correct replacement depends on tank height, toilet flush volume, refill requirements, and connection condition. Key […]