The BPCV Series Brass Piston Check Valves are available in inlet and outlet sizes of 1/4 inch, 1/8 inch, and 3/16 inch barbs. Seal options are Buna-N, EPDM and Viton®. Spring materials are Hastelloy and Stainless Steel but the valve is also available without a spring. The maximum operating pressure is 125 psi. The flow rate is 2.5 SCFM at 50 psi.