CHECK VALVE UNION Prevents back flow of water and sewer gas Full flow Extra wide flapper hinge prevents hinge stress Vertical or horizontal line Slips over ABS, PVC, steel or copper pipe Flexible neoprene unions Includes clamps, unicheck Rated at 25 PSI pressure (57 ft. of head) 130 deg. F max. 2" x 2" Plastic Slip x Slip Union