Fluidmaster Inc K-400H-040-T5 Toilet Fill Valve Flapper Kit

Product Description

The FLUIDMASTER INC K-400H-040-T5 is a toilet fill valve and 3-inch flapper repair kit designed for newer high-efficiency toilet (HET) 3-inch flush valve systems. The kit includes the PerforMAX fill valve and a 3-inch flapper with a silicone seal rated to last up to 10 times longer than standard rubber designs. The fill valve features easy-turn water control dials for independent adjustment of tank and bowl water levels. Built from chlorine-resistant and hard water-resistant materials, this kit is installed by plumbers and experienced DIYers performing toilet repair or maintenance.

This repair kit is engineered specifically for HET toilets equipped with 3-inch flush valves, a configuration common in water-conserving residential toilets manufactured in recent years. The adjustable arm design allows the flapper to fit a range of flush valve seats, and the dial adjustment on the fill valve enables water-savings tuning per flush. The complete kit reduces the need for separate fill valve and flapper sourcing during a single service call.

Key Features

• Silicone flapper seal rated to last up to 10 times longer than standard designs
• Compatible with HET 3-inch flush valve toilets
• Chlorine-resistant and hard water-resistant construction
• Adjustable flapper arms for broad flush valve seat fitment
• Adjustable dial on fill valve for per-flush water-savings control
• Includes both PerforMAX fill valve and 3-inch flapper in one kit

Compatibility

Designed as an OEM-style replacement kit for residential HET toilets with 3-inch flush valves.

Installation Notes

Installation is performed by a licensed plumber or qualified DIYer following local plumbing codes, including IPC guidelines where applicable. Shut off the water supply valve at the base of the toilet and flush to empty the tank before beginning work. Remove and dispose of the existing fill valve and flapper before installing the new components. Do not overtighten the fill valve locknut against the tank bottom to avoid cracking the porcelain.

Technical Specifications

• Flapper Size: 3 inches
• Flapper Seal Material: Silicone
• Application: HET 3-inch flush valve toilets
• Package Quantity: 5 per case
• Unit of Measure: EA
• Weight: 6.03 pounds

Standard Information

• Brand: FLUIDMASTER INC
• Manufacturer Part Number: K-400H-040-T5