In aluminum Flow rate 11gpm Maximum work pressure 25PSI Fuel inlet threaded: 3/4in NPT Fuel outlet: spout Ø 13/16in - (1/2in) Do not use nozzle with a hold-open device at installations (such as pre-pay) where the normal flow of products may be stopped or started by means other than with the hose nozzle valve. Use nozzle without hold-open device. Failure to comply is a violation of NFPA Code 30-A and may create a hazardous condition. Use of foreign objects to hold open automatic nozzle could result in shut-off failure and personal injury.