TruPlug is a soft, cone shaped plug designed to conform to the irregular and unpredictable shapes of a hull breach. Whether it's a round hole caused by mechanical failure, or an elongated tear due to impact, it adapts to slow or stop the leak. Unlike old fashion wooden plugs, TruPlug's unique shape allows it to be compressed by hand or cut to fit. It also gets into hard-to-reach locations and can also be pushed into a gap using a screw driver or similar tool. It is the true stop-gap solution for emergency leaks. It is recommended to have 1 TruPlug for each 10' of boat length. Usable 10 degree to 275 degree F, -12 degree to 135 degree C. Not for fuel leaks.