The Whirlpool WHKF-C9 O-ring for large Household Filtration Systems helping to provide a secure, leak proof seal. Whirlpool whole home filtration systems reduce the dirt and rust present in municipal water supplies to improve water quality for bathing, cooking and cleaning. Whole home filters also reduce the sediment from well systems that can get into home plumbing, adversely affecting water pressure and damaging major appliances. Use the WHKF-C9 O-Ring to prevent water leaks in your filter system. Try Whirlpool’s full line of filtration system products including whole home filters, undersink filters, ice filters, replacement filters, and more.