Buna-N Gasket for 22" Single-Bolt Flush Manhole (Model #SB540-ORNG22)

Buna-N Gasket for 22" Single-Bolt Flush Manhole (Model #SB540-ORNG22)

The Model #SB540-ORNG22 is an extended, heavy-duty replacement perimeter gasket engineered specifically for traditional 22" single-bolt flush manholes and tank top closures. Fabricated from high-density Buna-N Nitrile rubber, this molded loop seal drops directly into the cover plate's seating channel to form a dependable airtight and watertight boundary. It is formulated to withstand the intense, localized center compression force typical of high-span single-bolt structural clamping mechanisms, resisting long-term compression set over extended service lifecycles.

Key Features

  • High Compression Set Resistance: Engineered to maintain thickness and elastic memory under heavy, concentrated center structural clamping forces without stretching out of alignment.
  • Petroleum & Chemical Resilience: Excellent defense against degradation, swelling, or rotting when in constant contact with marine diesel, bilge water, hydraulic oil, or fuel sludge.
  • Seamless Loop Integrity: Factory-vulcanized as a solid continuous circle to prevent split-point or seam joint blowouts under static hydrostatic tank pressures across a larger 22" opening.