Oil Patch Swing Check Valves • Temp. range: 0° to 280°FFor use in oil patch flow lines and tank battery hookups. Feature stainless steel ball and stem, double O-ring Viton® stem seal and seat ring, blowoutproof stem, and 316 stainless steel 1-pc. hanger and disc. Zerk fitting for lubrication. Valves are full flow when open.Meet NACE MR0175 standards.