Delivery valve installations for firefighting purposes – Part 6: Wall hydrants with flat hose for trained personnel
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 10/01/2016

Delivery valve installation – Part 6: Dimensions of cabinets and installation of hose reels with lay-flat hoses according to DIN EN 671-2
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2009