Car Parts
Ampper High Current 1-2-Both-Off Battery Switch, 12-48 V Battery Master Cut Disconnect Switch Isolator with Lugs for Marine Boat, Ship, Yacht, RV, Truck (1-2-Both-Off, High Current Kit)
Customized Design & VERY Heavy Duty: design for 2 batteries high current situations, can switch to battery 1 / battery 2 separately or both and off together. ABS plastic housing, durable made for safety use, equiped with 4 sets of bolts, 6 pcs...
https://www.bizrate.co.uk/carparts1/ampper-high-current-1-2-both-off-battery-oid34298475504.html