Oatey K8331 Adjustable Toilet Flapper 3 Inch

Product Description

The OATEY K8331 is an adjustable toilet flapper designed for 3-inch flush valves in residential and light commercial toilets. It features a chemical-resistant silicone seal that provides a durable, watertight closure and resists degradation from common tank cleaning tablets and water treatment chemicals. The adjustable design includes a timing cone that allows the installer to control the flush volume by varying how long the flapper stays open during each flush cycle. Licensed plumbers and experienced DIYers install this part as a direct replacement when a toilet runs continuously or fails to flush completely.

This flapper is suited for toilet repair applications where the existing 3-inch flush valve seat needs a reliable replacement seal. The timing cone adjustment makes it appropriate for low-consumption flush valve conversions and situations where flush performance needs to be dialed in after installation. It fits most standard 3-inch toilet flush valves and is sold individually in blister pack packaging for single-unit service calls.

Key Features

• Chemical-resistant silicone seal resists degradation from tank tablets and treated water
• Adjustable timing cone controls flush duration and water volume per flush
• Designed for 3-inch toilet flush valves
• Sold as an individual unit in blister pack packaging

Compatibility

Fits most 3-inch toilet flush valves in residential and light commercial applications.

Installation Notes

Installation is performed by a licensed plumber or qualified DIYer. Shut off the water supply valve at the base of the toilet and flush to drain the tank before beginning work. Remove the old flapper from the flush valve seat pegs and disconnect the lift chain before installing the new unit. Adjust the timing cone position after reinstalling to achieve the desired flush volume, then restore water supply and confirm the flapper seats without leaking.