2021DS/EN 1254-4:2021 Copper and copper alloys – Plumbing fittings – Part 4: Threaded fittings
2001DS/EN 1254-4/AC:2001 Copper and copper alloys - Plumbing fittings - Part 4: Fittings combining other end connections with capillary or compression ends
1999DS/EN 1254-4:1999 Copper and copper alloys. Plumbing fittings - Part 4: Fittings combining other end connections with capillary or compression ends