Fluidmaster Inc K-400H-043-T4 Toilet Fill Valve Flapper Kit

Product Description

The FLUIDMASTER INC K-400H-043-T4 is a 2-piece toilet fill valve and flapper kit designed for residential toilet repair and maintenance. The kit pairs the Performax fill valve with a convertible Super Flapper that works as either a 2-inch or 3-inch toilet flapper. The Performax fill valve delivers 2x greater bowl refill compared to standard fill valves, supporting a more powerful flush cycle. This kit is installed by plumbers and experienced DIYers working on tank-style toilets. The convertible flapper design allows a single part to replace either flapper size, reducing the need to stock multiple SKUs.

This kit is suited for residential toilet repair applications where either a fill valve, a flapper, or both components need replacement. The universal design fits most 2-inch and 3-inch flush valves across common toilet brands. Water use can be adjusted on both the fill valve and the flapper independently, allowing the installer to balance flush performance against water conservation requirements. The kit is packaged as a single unit containing both components.

Key Features

• Convertible Super Flapper fits both 2-inch and 3-inch flush valves
• Performax fill valve delivers 2x greater bowl refill for stronger flush performance
• Adjustable water use settings on both fill valve and flapper
• Universal fit across most residential tank-style toilets
• 2-piece kit includes fill valve and flapper in one package
• 7-year manufacturer warranty

Compatibility

Designed as a universal OEM-style replacement kit compatible with most residential tank-style toilets using 2-inch or 3-inch flush valves.

Installation Notes

Installation is typically performed by a licensed plumber or qualified DIYer following local plumbing codes. Shut off the water supply valve behind the toilet and flush to drain the tank before beginning work. Disconnect the fill line and remove the existing fill valve and flapper before installing the new components. Follow the manufacturer instructions included with the kit to convert and seat the flapper to the correct size before installation.

Technical Specifications

• Flapper Sizes Supported: 2 inches, 3 inches
• Kit Components: 2 pieces (fill valve and flapper)
• Weight: 5 pounds
• Unit of Measure: EA
• Package Quantity: 4
• Warranty: 7 years

Standard Information

• Brand: FLUIDMASTER INC
• Manufacturer Part Number: K-400H-043-T4