Captain O-Ring - Whirlpool WHKF-DWHV, WHCF-DWHV, WHKF-DWH & WHKF-DUF Water Filter Replacement Orings (3 Pack) Replacement O-Rings for Whirlpool filter housings that require a 2.5 inch cartridge Includes three (3) o-rings O-Ring inner dimension 3.48 inch x 0.14 inch (88mm x 3.53mm). Please note that these o-rings are for filters that accept the thinner 2.5 wide filter cartridge and not the larger 4.5 wide filter cartridge. Durable Nitrile Butadiene (Buna-N) Rubber Construction Manufactured and Warrantied for one year by Captain O-Ring LLC