Building supply fitting for dry risers Two 45° inlet elbows with solid adapters Storz B allow kink-free attachment of hoses. Built-in, large sized, spring loaded non-return valves. Drainage of the unit possible with attached tap and pipe (style 7500 A + 7500 B). Upright built-in possilbe. In this case inlet elbows have to be turned by 180°, than drainage valve is not part of the fitting (style 7501 A + 7501 B). With the new "design line" (type 7500 B + 7501 B) we realise and fulfil the demands of architects and city delvelopment, taking into consideration that basically technical fire data requirements, performance data and material instructions correspond to the Standard. The building supply elbows can be adjusted by a simple turn, always in accordance to the local circumstances. The standard colour will be red RAL 3000 - other variations of colour on demand. Storz System Connection or thread