Smith-Cooper International 9191L Series Brass Swing Check Valve, Potable Water Service, 1" NPT Female Made from brass for higher corrosion resistance than steel Female NPT threads for connecting to male threaded pipes Maximum pressure ratings of 200 psig for WOG Maximum working temperature of 350 degrees Fahrenheit Meets NSF/ANSI 61-8 for quality assurance and is certified to California AB1953