CHECK VALVE UNION lie flow of water and sewer gas rotund flow histrion opened flapper hinge prevents hinge stress statant or naiant line Slips over ABS, PVC, steel or copper pipe elastic neoprene unions Includes clamps, unicheck Rated at 25 PSI pressure -LRB- 57 ft. of head -RRB- 130 deg. F. '' x 2 '' impressionable Slip x Slip Union .