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Figure 2(a) – Connection of a condensate drainage pipe downstream of a sink, basin,
bath or shower waste trap
Key
1 Boiler
2 Visible air break
3 75 mm trap
4 Visible air break and trap not required if there is a trap with a minimum condensate
seal of 75 mm incorporated into the boiler. In this case the 100 mm is measured to the
trap in the boiler.
5 Sink, basin, bath or shower
6 Open end of condensate drainage pipe direct into gully 25 mm min below grating but
above water level; end cut at 45 °
7Sink lip
8 Minimum internal diameter 19 mm
9 Pipe size transition
10 Minimum internal diameter 30 mm
11 Water/weather proof insulation
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