Toilet Flush Valve Seal Replacement

Member-Contributed Guide

Member-Contributed Guide

An awesome member of our community made this guide. It is not managed by iFixit staff.

This guide is specific to a Flushmaster brand (Flushmaster, Inc.) toilet Flush Valve Seal that fits Mansfield(R) 210 & 211 Flush Valves. However, the shortcut method may also be applied to many other brands of toilet flush valves.

This is a shortcut, time/labor-saving, method of installing a replacement "flush valve seal" to stop water inside the toilet tank from seeping/leaking down the drain (and the continuous, annoying sound that accompanies this water loss).

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Edit Step 1 Flush Valve Seal  ¶ 

  • This is the New Valve Seal used in this guide, available at hardware stores and home centers.

  • Using this New Seal installation shortcut method, it will NOT be necessary to do the following (of the original instructions that accompany the New Seal product): "Turn off water supply to toilet and drain tank" and "Unhook trip lever..." [any "chain" will need to be momentarily unhooked.] and "Unthread stop cap..." and "Lift float assembly off....."

Image #1

Edit Step 2  ¶ 

  • Remove the top of the toilet tank.

  • With a towel nearby, roll-up your sleeves. Flush the toilet to lower the tank water level.

  • Immediately identify the old, worn [red] Valve Seal at bottom of the vertical assembly of Overflow Tube and Float.

  • Reach into water tank and remove the worn valve seal by pulling it, like an old rubber band, with your finger tips (or pliers) until it breaks.

Image #1

Edit Step 3  ¶ 

  • Roll the new seal and stick it through the square trip lever holder and lasso the free end of the trip lever (the opposite end of the lever is attached to the flush lever outside of the tank).

  • Keeping the trip lever through large center hole of the new seal, pull the new seal in the reverse direction back through the square trip lever holder. Turn the trip lever holder as you do this to allow more space to ease the new seal back through.

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Edit Step 4  ¶ 

  • When the new seal is between where the trip lever is connected to tank and where trip lever protrudes through square trip lever holder, for a moment, pull the flexible water refill tube out of the center of the stop cap. Point the free end of it down, as water may still be coming through it after flushing.

  • Take the new seal just over the stop cap and replace the water refill tube, being careful not to splash any water coming out of it.

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Edit Step 5  ¶ 

  • Gently stretch and pull the new seal all the way down the vertical assembly of the overflow tube and float near the bottom and position it into its top groove of the flush valve.

  • Once in place, you should be able to gently grasp the edge of the new seal and turn it in place in the groove, around the base of the flush valve. Check the seal by flushing, watching and listening.

Image #1

Edit Step 6  ¶ 

  • This is the reverse side of the Flush Valve Seal package.

Flush Valve Seals will need to be replaced, at least, once every few years, depending on water condition. Other kinds of toilet water tanks may have similar assemblies. Why call a plumber for something so easy to do yourself?!

For more information, check out the Toilet device page.

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Comments Comments are onturn off

We have a NEW WAXLESS toilet seal.

It is extremely EASY to install and made of flexible, durable materials that are guaranteed to last.

We won Retailers Choice award at the National Hardware Show and Sani Seal Toilet Gasket is MADE IN USA.

Please check out our website at

James Sweet, · Reply

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