Ocean Reef 1st Stage SL35TX INTThe SL35TX high performance, 1st stage has a balanced diaphragm with anti-freeze kit. It has an adjustable intermediate pressure and is made of brass with a plated chromed finish body, stainless steel piston, Teflon seat, and stainless steel spring. It is available with the following characteristics: 2 high pressure ports 7/16 -20 UNF4 low pressure ports 3/8-24 UNFFlow rate of approx. 4800 l/m at 140 bars