Rainbird Plastic ASVF Series Electric Valve with Flow Control and Atmospheric Backflow Preventor, 3/4"/24 VAC 3/4 in. (20/27) plastic residential irrigation valve Combination reliable DVF valve and atmospheric backflow preventer in one unit Incorporates all features of DV/DVF Series valves - I.A.P.M.O. and A.S.S.E listing approved City of Los Angeles listing approved - Canadian Standards Association approved All of our valves work with any standard sprinkler timer