1. BS ISO 161-1:2018+A1. Thermoplastics pipes for the conveyance of fluids. Nominal outside diameters and nominal pressures. Part 1. Metric series (30th June 2022) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (9 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗