Components Component Material designation Design standards Delivery condition Pipe coupling 1.4404, AISI 316L DIN EN 10088-3 -- Special nut Seamless tubes 1.4571, 1.4404, 1.4435, 1.4301, 1.4306 DIN EN 10216-5 DIN [...] spaces of category A. 14 Water filled fire extinguishing systems (e.g., fire main, sprinkler) Approved 15 Non water filled fire extinguishing systems, e.g., foam, drencher systems Installation limited to on [...] Tube O.D. Tube O.D. Nominal pressure Metric mm Inch PN MPa 6, 8, 10 3/16”, ¼”, 5/16” 50 12 3/8” 40 14, 15 ½”, 5/8” 40 16, 18 ¾”, 7/8” 32 20 1” 25 22 -- 25 The nominal pressure PN specified in the VOSS catalogue