Non-Balanced Flow-By Piston Fail-Safe First Stage Design 300 BAR/4500 PSI DIN Connection, Metal DIN Hand-Wheel Connector / 232 BAR YOKE Connector Material: Durable and Corrosion Resistant, Marine-Grade Chrome Plated Brass 4 LP 3/8" Threaded Ports 1HP 7/16“ Threaded Port Optional O2 clean version with M26 DIN adapter