Toto 9BU001ER Flapper Seal Gasket Toilet Tank

Product Description

The TOTO 9BU001ER is a flapper seal gasket designed as a direct replacement component for TOTO toilet tank assemblies. The flapper seal gasket creates a watertight seal between the flapper valve and the flush valve seat, preventing water from continuously leaking from the tank into the bowl. Over time, flapper seals degrade due to mineral buildup, chlorine exposure, and normal wear, making this a routine service part for plumbers and facilities maintenance technicians. Replacing a worn flapper seal is one of the most common repairs performed on residential and light commercial toilet systems.

This part is suited for use in toilet tank assemblies where the flapper seal has become brittle, warped, or no longer seats properly against the flush valve. Typical installation scenarios include routine toilet repair, water conservation service calls where phantom flushing or continuous running is reported, and preventive maintenance on aging fixtures. Plumbing contractors and facilities maintenance staff regularly stock flapper seals for quick turnaround on toilet service calls.

Key Features

• Direct OEM-style replacement seal for TOTO toilet tank flapper assemblies
• Restores watertight seal at the flush valve seat to stop tank-to-bowl leaks
• Addresses common causes of phantom flushing and continuously running toilets
• Compact, low-profile component for straightforward swap-out service

Compatibility

Designed as an OEM-style replacement flapper seal gasket for TOTO toilet tank assemblies. Refer to the TOTO parts lookup or the toilet model documentation to confirm fitment before installation.

Installation Notes

Installation is performed by a licensed plumber or qualified maintenance technician. Shut off the water supply at the fixture stop valve and flush the tank to drain before beginning any work. Remove the existing flapper assembly, inspect the flush valve seat for damage or mineral scale, and clean the seat surface before seating the new gasket. Verify a full seal by restoring water supply and observing the tank fill cycle for any continued leakage.

Technical Specifications

• UPC: 739268443112

Standard Information

• Brand: TOTO
• Manufacturer Part Number: 9BU001ER