ev project
+1y
...or "Feed Throughs"...Thats what I call them and what the places I get them from have called them....I'm sure they have other names. They are used like a bulkhead for hydraulics and pneumatics. They bolt into the frame and let the 'juice flow through without actually running the wires through the frame and HOPING it doesn't rub through the wire (or hose or air line). They're sweet looking on the frame but if you use them, make sure you get ones that are rated for the power you're using. The one pictured has a connection on the backside for the wire that's inside the frame. The big ones I'm using cost about $38 bucks a piece and the small ones about $18 each...not cheap... has them...