Kitchen Sink / Bath Waste Trap - 1 1/2" to 40 or 50 mm - 1 1/2" bstp = 47.80mm
Flexible Waste Trap - 1 1/2" to 40 or 50 mm - 1 1/2" bstp = 47.80 mm (Approx). Other end connected to 40 or 50 mm female Push fit / Solvent / Compression connector. Vent Cowls. Air Vent Grills. Ours is quoted in actual sizes i.e 40 mm is 40 mm.