The StaPlug is the modern solution for emergency leaks on any boat and for maintenance of valves and thruhulls. 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 from a collision. Unlike old fashioned wooden plugs, StaPlug's soft cone shape 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". Not for fuel leaks.