Constructed of injection molded ABS, this valve allows for a 6 position operation: Filter, Backwash, Rinse, Recirculate, Close & Waste. 200 Series AstralPool Multiport Valves have a 6 screw type lid system that allows any system to be adapted to it. Pump, Filter, Backwash and Waste connections are threaded. The "In" connection is threaded and the "Out" connection is slip. Standard PVC glue or Multi-purpose glue required. Do not use blue/quick type dry glue. For 24" Aster and Millennium Series Filters.