The Automatic Shut-Off Fuel Dispensing Nozzle has an approximate 13/16" spout (.6"ID X .788"OD) with a 3/4" FPT inlet which makes it compatible with most 3/4" fuel hoses without the use of any adapter fittings. The auto shut-off unleaded nozzle is for use with gasoline, 15 percent ethanol, methanol and gasoline blends, and diesel fuel. Features a hold-open handle clip for fast, effortless filling. The red, vinyl covered handle improves operator comfort and product identification while protecting the vehicle from scratches and nicks, and insulating the hand when in use. Note: A minimum of 15 PSI is required to operate the auto shut-off. Designed for pump driven fuel systems with a minimum of 15 PSI and a maximum of 43 PSI. Do not use on gravity flow systems.