NPOLY (full company name National Polymer Group) is a major Bangladeshi manufacturer of uPVC, CPVC, PP-R pipes & fittings.
In a specification sheet for uPVC SWR pipes (by another manufacturer) the size 250mm × 6 m SWR is listed, with wall thickness ~3.1mm and ~3.9mm for different grades.
A general price list (Bangladesh) shows 250 mm × 6 m uPVC SWR grey pipe at various wall thicknesses, indicating this size is normally offered.
The term “SWR” stands for Soil, Waste & Rainwater – these pipes are intended for drainage, waste, rainwater disposal systems.
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