Caroflow Roof Drainage Products 

 

Two-Way Outlets Specifications 

Caroflow Two-Way Outlets are available in either LM6 Aluminium Silicon casting alloy to BS EN 1706:2010 for most roof finishes or in leaded gunmetal to BS EN 1982:2008 for use with lead or copper-clad roofs or for connection to copper pipework. They are female parallel threaded to BS21:1985. 

Our Two-Way outlets are available in four sizes; 50mm, 75mm, 100mm and 150mm spigot sizes. 

 

The codes and dimensions of each of our Two-Way Outlets is as follows; 

 

50mm Two-Way Outlet 

Code 

– 50/TW 

 

A = 213, B = 50, C = 202, D = 76, E = 193, F = 255, G = 143, H = 70 

 

75mm Two-Way Outlet 

Code 

– 75/TW 

 

A = 213, B = 50, C = 202, D = 105, E = 193, F = 255, G = 143, H = 70 

 

100mm Two-Way Outlet 

Code 

– 100/TW 

 

A = 213, B = 50, C = 202, D = 130, E = 193, F = 255, G = 143, H = 70 

 

150mm Two-Way Outlet 

Code 

– 150/TW 

 

A = 278, B = 50, C = 290, D = 181, E = 250, F = 316, G = 200, H = 73 

 

Caroflow Two-Way outlets are suitable for connection to, Screw Threaded Steel and Copper (Gunmetal only). By using the Caroflow Threaded Adaptor, the Two-Way outlets are also compatible with PVC, Aluminium and Cast Iron. 

Drainage Areas & Flow Rates for Two Way Outlets 

BS EN 12056-3:2000 (Gravity drainage systems inside buildings – Part 3: Roof drainage, layout and calculation) now specifically limits the drainage capacity that can be used to calculate areas to be drained, so as to prevent siphonic action that may damage internal pipework. 

 

Previous physical testing of all our outlets has shown that the rates and areas (see adjacent table) are lower than results that have been seen from this actual testing. 

 

All rates assume that the outlet grate is free and clear of any debris/blockages 

 

Results are based on a rainfall intensity of 75mm per hour and a 35mm head of water adjacent to the outlet (45mm head for 160mm outlets as per EN 1253-2:2015). 

 

The flow rates shown should be used as a guide only. Each drainage area will have individual features that may influence overall flow characteristics. 

Accessories 

Example Specification