Smith-Cooper International CV30L Series Brass Check Valve, Potable Water Service, 1" NPT Female Made from brass for higher corrosion resistance than steel Includes EPDM seat and seal, stainless steel spring, and spring-loaded poppet Female NPT threads for connecting to male threaded pipes Cracking pressure is 2 psi and maximum pressure rating is 200 psi Meets NSF/ANSI 61-8 for quality assurance and is certified to California AB1953