Aqua-Pure AP101T / AP102T Whole House Water Filter Housing Replacement O-Rings (2) with Silicone Lubricant Packet for O-rings (1) Two replacement o-rings for Aqua-Pure housings AP11S, AP11T, AP12S, AP12T, AP26T, AP51T, AP101S, AP101T, AP102S, AP102T and more. Silicone lubricant packet for o-rings, gaskets & seals ~ Small reusable .1 oz packet O-ring approximate dimension 3.5 inch. Durable Buna-N construction. Keep a spare oring on hand to avert an urgent situation.