Whirlpool Water Filtration Accessories For best results use only Whirlpool® genuine parts, and accessories with Whirlpool® Filtration systems. WHKF-C8 O-Ring for Standard Systems WHKF-C9 O-Ring for Large Household Filtration System WHKF-B6 Mounting Brackets for Filter Housings WHKF-B7 Mounting Brackets for Filter Housings