Concrete pool - Wall bushings Wall conduits in ABS Wall conduit in ABS with smooth Ø 63 mm rear connection and smooth Ø 50 mm inner wall Range of 300 mm long conduits for Ø 2" inlets and Multiflow that can be cut to different lengths, depending on the thickness of the pool wall. Made of ABS. The ribs of the end plates have holes for fitting the wall conduit to the pool structure, which makes assembly straightforward.