Astralpool wall conduit for concrete pools rear 63 mm solvent weld and inside Ø 50 mm Front Ø 59.3 mm. inner diameter for gluing. A new range of 300 mm conduits for Ø 2″ inlets and “Multiflow”, that can be easily be cut to required lengths depending on pool shell thickness. Made in ABS. They all have 2 holes for positioning within the pool shell.