SinkSEAL Kitchen Sink Gasket - "U-channel" Designed to work on "U-Channel" style top-mount sinks. DO NOT PURCHASE IF YOUR SINK DOES NOT HAVE A U-CHANNEL FASTENING SYSTEM LIKE THE ONE IN OUR PHOTOS! Purchase our "Universal 2 in 1" gasket instead. Eliminates the use of messy caulk, putty or silicone for a clean and quick installation Resistant to household cleaners, solvents, grease, and mold Durable, long-lasting closed-cell construction won't absorb water, crack, or dry out Seals sinks with a space of 5/32" to 9/32" height between the counter surface and mounting area of gasket