Sierra MP39590 Heavy-Duty Push-Pull Switch - Off-On(1)-On(1&2) SPDT Sierra products are engineered to meet todays high horsepower engine demands and stand up in the harsh marine environment. All Sierra products meet or exceed the original equipment part it replaces. Sierra supplies many OEM engine manufacturers and boat builders hundreds of quality parts every day. Chrome plated brass knob 3/8" mounting bushing First pull energizes #1 Second pull energizes both circuits Rated: 15 Amps @ 12 VDC