This Pro Marine Safety Kill Switch is a must-have for all boat owners who value safety on the water. It is compatible with all 4-wire systems and has a manufacturer part number of 237488. With a unit quantity of 20, you can stock up and ensure that all of your boats are equipped with this essential safety feature. The switch is designed to quickly and easily shut off the engine in case of an emergency, helping to prevent accidents and protect your passengers. Don't take any chances when it comes to boating safety - add the Pro Marine Safety Kill Switch to your collection today.