The modern alternative to wooden emergency plugs.Smart insurance against an out of control leak, Sta-Plug has unique edge gripping riblets to help hold it in place. Sta-Plug is a cone shaped plug made of a proprietary foam formulation that is solid, spongy and coated with a flexible sealer. Capable of sealing round, oval or irregular holes in boat hulls, Sta-Plug is compressed by hand and inserted into the hole stopping or reducing the inward flow of water as the foam returns to its original shape. Sta-Plug can be cut with a razor knife or torn by hand and forced into elongated openings using a putty knife or similar tool. Usable 10 to 275 F.Key Features Adjustable: Can be torn near 8th ring to make a smaller 2" diameter plug Dimensions: 9" High x 5" Dia. at base