Marine Boat Kayak Canoe Black Hull Drain Plug Nylon 3/4" Diameter 3"(L) X 1"(W) This is a small Black Hull Drain Plug that is made of nylon. It has a diameter of 3/4". This hull drain plug will stop water infiltration, and it is used to drain the water out of the inner hull of the boat. This item is easy to install. Dimension: 3" (L) X 1" (W).