Part 71603 Center Stand Pipe for 16" Sand Filter TanksReplacement internal standpipe for Swimline Hydrotools 16" sand filters and sand filter systems systems The Part 71603 Center Stand Pipe for 16 Inch Sand Filter System Tanks Features Include Genuine Hydrotools replacement part for Hydrotools 16" sand filters and sand filter systems Replaces standpipe found in Model 71610 sand filter systems Replacement standpipe for Model 71600 sand filter Constructed of heavy duty materials Genuine Hydrotools