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Please note bolts are not included and must be purchased separately. This product is used to seal the ends of a pipeline or any connection. It comes in various sizes: DN15 with a diameter of 95mm and thickness of 14mm, DN20 at 105mm and 16mm, DN25 at 115mm and 16mm, DN32 at 140mm and 16mm, DN40 at 150mm and 16mm, DN50 at 165mm and 18mm, DN65 at 185mm and 18mm, DN80 at 200mm and 20mm, DN100 at 220mm and 20mm, DN125 at 250mm and 22mm, DN150 at 285mm and 22mm, and DN200 at 340mm and 24mm. All sizes are designed to fit steel pipe's nominal bore size according to BS-EN1092-1:2007. Nominal bore refers to the inside diameter of a pipe.. JTM PN16 DN50 Blank Flange - 2 inch Black Steel FL-025-B