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The BSC PREFERRED DIB835-84 is a sponge rubber tank to bowl gasket designed to seal the connection between the tank and bowl on American Standard toilets. This gasket creates a watertight seal at one of the most common leak points in a toilet assembly. Sponge rubber construction allows the gasket to compress evenly under the tank bolts, accommodating minor surface irregularities and maintaining a reliable seal over time. Plumbers and service technicians reach for this part during toilet rebuilds, leak repairs, and routine maintenance calls where the original gasket has deteriorated, compressed flat, or begun to weep.
This gasket is suited for residential and light commercial plumbing applications where an American Standard toilet tank must be reseated or replaced. It is a common service item on standard two-piece toilet installations. The part ships as a single unit and is typically installed as part of a broader tank rebuild that may also include new tank bolts, washers, and a fill or flush valve replacement.
Designed as an OEM-style replacement tank to bowl gasket for American Standard brand toilets.
Installation is performed by a licensed plumber or experienced service technician. Shut off the water supply at the stop valve and flush the tank fully before removing the existing tank hardware. Inspect tank bolts, washers, and nuts for corrosion and replace as needed when fitting the new gasket. Do not overtighten tank bolts, as uneven stress can crack the porcelain.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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