Manufactured from marine grade ABS, inteliPlug is rugged and completely corrosion proof. inteliPlug TR features an ergonomic cap that allows the user to open and close inteliPlug by hand instead of having to use a wrench or pliers. The cap is spring loaded and captive which means it stays attached so it cannot get lost or misplaced. inteliPlug also features an optional alarm system which reminds boaters to close inteliPlug before launching their boat. This new drain plug was skillfully engineered and rigorously tested to perform in fresh and salt water, high vibration environments, to withstand fuels and lubricants that can spill into the bilge and to help boaters adhere to the new clean, drain, dry invasive species laws.