(1 1/2") Screened Tank Overflow Kit (38mm NB - 41mm OD) A Screened overflow Kit for a potable (drinking) water tank must be at least twice the size of the inlet used on the tank. The overflow fitting is a necessary item for any storage tank, and part of the water Regulations for potable water tanks these Overflows must be screened to prevent igress of insects into the tank, these regulations were more commonly known as BYLAW 30. 1 1/2 Inch = 38mm NB PP = 41mm OD UPVC = 48.3mm OD (1 1/2") PP/UPVC Screened Overflow Fitting with (3/4") PP Screened Warning Pipe, (3/4") PP Screened Tank Vent, Available in: PP - Polypropelene UPVC All screens inside these fittings are made from Stainless Steel.
