Heavy Duty Metal Water Filter Housing Wrench #4 for Whirlpool Models Fits Whirlpool Valve-In-Head Clear WHKF-DWHV, Whirlpool Opaque Whole-House Pre-Filtration Housing WHKF-DWH, Whirlpool Under Sink Drop-In Water Filtration System WHKF-DUF (3.8" inside diameter) Heavy-duty 7-gauge steel that won't break, bend or strip the housing unit. ) Handle is rubberized and longer than a standard filter wrench which gives you extra leverage; Handle is also imprinted with a directional arrow to ensure proper removal of the housing unit. Made in the USA