The modern solution for emergency leaks on any boat and for maintenance of valves and thru-hulls. The StaPlug is a soft, cone shaped plug solid, spongy and coated with a flexible sealer to deal with any hull breach from a small hole or a large tear. The soft cone shaped form allows it to be compressed by hand or cut to fit into any hole whether in the hull or even in leaky or damaged pipes and other thru-hulls. Keep a couple on hand as the near perfect "just in case". Description Sta-Plug^® Ribbed Plug Size 9" H