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Oil Patch Swing Check Valves, Temp. range: 0 to 280F,For 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.