Just checked out things on my truck for you. The "T" end of the strap uses a pin with a flat washer on it and then goes thru bracket and uses a cotter pin on the other end. No flat washer by the cotter pin...seems as though it should have on but neither on of them has one. On the threaded end of the strap, It has a SAE flat washer first, then a standard nut and after that it has a lock-nut. It appears to me that the suction side uses the 1/2" port. Hope this helps. Don
