Fluidmaster K-400H-039 Toilet Fill Valve & 2-Inch Flapper Repair Kit – Universal Fit

Restore Your Toilet's Performance in Minutes

The Fluidmaster K-400H-039 is a complete toilet repair kit that includes a PerforMAX high-performance fill valve and a 2-inch adjustable flapper — everything you need to fix a running, slow-filling, or leaking toilet. Designed for universal fit with standard 2-inch flush valves, this kit replaces worn or outdated components to get your toilet working like new.

What's Included

• PerforMAX Fill Valve – High-performance fill valve that refills the tank faster and quieter than standard valves; adjustable height fits most toilets
• 2-Inch Adjustable Flapper – Replaces worn flappers on toilets with a 2-inch flush valve; adjustable for the right water level and flush performance

Key Benefits

• Universal Fit – Compatible with most toilets using a standard 2-inch flush valve
• Stops Running Toilets – Fixes the most common causes of a constantly running or slow-filling toilet
• Easy DIY Installation – No special tools required; installs in minutes with simple hand-tightening
• Durable & Long-Lasting – Fluidmaster is the #1 trusted brand in toilet repair, built to last for years

How to Install

1. Shut off the water supply valve behind the toilet
2. Flush to empty the tank, then remove the old fill valve and flapper
3. Install the new PerforMAX fill valve and adjust height as needed
4. Attach the 2-inch flapper to the flush valve and connect the chain
5. Turn water back on, adjust the flapper for optimal flush, and test