Check the listing for details. 54000099B O-Rings for Perko 540 Series Deck Fill Caps Gas, Diesel, Water (3pk). Condition: New. Listed at 9.99 USD. 54000099B O-Rings for Perko 540 Series Deck Fill Caps Gas, Diesel, Water (3pk) Product Features: O-Ring Part Number: 54000099B The 54000099B o-ring is compatible with Perko 540 / 0540 series deck fill caps. These caps are used with boat/marine gas, diesel, water, and waste fill systems. The 54000099B o-ring measures approximately 1-3/4” across the inside diameter with a thickness of slightly over 1/8” (0.14”). An exact OEM match for size, tolerance, and material for long lasting durability and performance, just like when your cap was brand new! Package contains three (3) o-rings. Restore multiple 540 series deck fill caps, or keep extras on hand as spares with this handy 3-pack. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA! Restore the air-tight seal on your deck fill cap with Captain O-Ring’s replacement 54000099B o-rings. The 54000099B o-ring is compatible with Perko 540 / 0540 series deck fill caps. These caps are used with boat/marine gas, diesel, water, and waste fill systems. This o-ring measures approximately 1-3/4” across the inside diameter with a thickness of slightly over 1/8” (0.14”) for a perfect OEM fit. Package contains three (3) o-rings. Restore multiple 540 series deck fill caps, or keep extras on hand as spares with this handy 3-pack. Manufactured and warrantied by Captain O-Ring LLC. Proudly assembled in the USA!