Aeromotive High Flow Hex Drive Fuel PumpThe Atomic Hex Drive Pump features the same performance you get from our Atomic Belt Drive Pump (P N 11115), with the convenience of direct drive. The Hex Drive Fuel Pump features a hex drive shaft and mounting collar designed to be mounted and driven directly from the back of a properly prepared external oil pump or driven directly by the cam through a timing cover adapter. Utilizes standard, 3 8 hex drive shaft and adjustable, billet mounting collar