Smith-Cooper International 9192L Series Brass Swing Check Valve, Potable Water Service, 3/4" Solder End Made from brass for higher corrosion resistance than steel Solder connection is heat to seal the joint with a filler material to prevent leaks Maximum pressure ratings of 200 psig for WOG and 125 psig for SWP Maximum working temperature of 350 degrees Fahrenheit Meets NSF/ANSI 61-8 for quality assurance and is certified to California AB1953