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I purchased this to mount in my camper shell as a power distribution block for accessories. I camp in the back of a pickup sometimes and needed a way to connect the lights, fan and chargers in the back. I ran a large gauge power and ground circuit from an auxillary battery in the front of the truck inside the bed of the truck. The power circuit then connects to this block and from there I can fuse each accessory separately. I like the plastic cover to keep from shorting anything out across the terminals.
I am a diesel mechanic and run across marine grade products like these in boats/yachts quite often and I'm always very jealous/impressed at the quality. It seems the auto parts stores never carry products of this caliber.