Before you put them in it might be wise to take a pieco of shoestring and thread a loop through the center of the foam to make a pull handle, knot the bottom really big (to keep from pulling throug... use a coat hanger to make a jumbo "needle" to thread the string through the foam.) This provides a fast "drain" in case of a water level emergency...ie....lots of waves crashing over your boat, or biblical downpour....[wink]