0020308121_04 Installation and maintenance instructions 23
7.7.1.1 Direct Connection to internal soil and vent
stack
Preferred option
7.7.1.2 Direct connection to external soil and vent
stack
7.7.1.3 External termination to gulley or hopper
Best practice
7.7.1.4 Internal termination into combined sink
waste
Preferred option for external termination
7.7.1.5 External termination into soakaway
≥ 500 mm
100 mm
< 300 mm
50 25 25
< 25
25
Ø12
Ø32mm
≤ 3 m
1
2
3
4
5
6
1 Ground (either/or)
2 Seal
3 Plastic tube,
100 mm diameter
4 Bottom of sealed tube
5 Limestone chippings
6 Hole depth 400 mm
minimum
Least preferred option, must not terminate in rain water drain
7.7.1.6 Internal termination downstream of sink
waste
Open end of pipe direct into gulley below ground level but
above water level
Susceptible to siphonage, must terminate in a gulley
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