Amazon.com: Nilight - 90015A Battery Switch 12-48V Waterproof Heavy Duty Battery Power Cut Master Switch Disconnect Isolator for Car Vehicle RV and Marine Boat (On/Off),2 Years Warranty : Automotive
Marinco Marine Battery Selector Switch in the RV Accessories department at Lowes.com
Battery Switch Box - Single | Boat Outfitters
Battery switch 100 A - marine equipment - ROCA Industry