Compatible With Watkins Spa Filter Standpipe, AG Plus, '97 Forward, Tiger River And Limelight DIYCP36531. This is the replacement filter standpipe used in all Tiger River and Limelight Spas from 1997 to current. It is able to accept filter part number 71827 as well as hold an Freshwater AG+ Silver Ion Cartridge (PN 71325) inside this stand pipe.
