RS Pro Brand Screwed End Swing Check Valves that allow liquids to flow in only one direction., 1/2 - 3 Inch (DN15 - DN80). W.P: 200 WOG. W.T: -20°C - 200°C (-4°F - 392°F). Investment casting. Socket weld (option). Thread type: ASME B1.20.1 (NPT), DIN 2999