Check the listing for details. GRAINGER APPROVED CHK BRS 850-8F8F-B Poppet Spring Check Valve 4DHR1. Condition: New. Listed at 41.31 USD. Item - Check Valves Check Valve, Flow Design Single, Mechanism and Body Design Inline Poppet, Body Material - Valves Brass, Pipe or Tube Size 1/2 in, Connection Type FNPT x FNPT, Cracking Pressure 1 psi, Mounting Orientation Horizontal, Vertical, Seal Material Buna-N, Max. Temp. - Valves 180 Degrees F, Min. Temp. - Valves -20 Degrees F, Max. Water Pressure - Valves 1,200 psi, Max. Steam Pressure - Valves Not Rated, Seat Material Brass, Spring Material Stainless Steel, Full Flow - Valves Yes Ideal for installation in tight spaces, this poppet spring check valve can provide backflow protection for a variety of applications. Model has an O-ring that is captured in a brass poppet to seal on a brass seat in the check valve body. Valve is designed to provide a positive seal at very low back pres.