"KBI" SCH 40 SPRING CHECK VALVE FIPT X FIPT1"For preventing back flow and keeping prime in water systems1/2 pound spring gives positive seal with no back pressureHigh-impact PVC type II material for use in hot or cold fluid systems up to 40 deg. F150 PSI working pressure at 73 deg. FComplies with all applicable ASTM & ANSI standardsMade in the USA by KBIBulk