1. Inspection chamber - IC Inspection chamber - IC
Separate System
Soil vent pipe SVP
Nowadays most new systems are separate. The red pipe (foul) carries waste from the bath, basin, sink and WC. The blue pipe (storm) carries rainwater and surface water.
House1
House 2
Gully
Inspection chamber - IC
Rainwater pipe - RWP
Inspection chamber - IC
Storm sewer and foul sewer
In road
Manhole

2. Separate System – typical fittings
Simple rest bend at foot of SVP – no need for a trap
Separate System – typical fittings
Shallow plastic inspection chamber
Simple rest bend at foot of RWP – no need for a trap
Access gully picks up waste from sink(s)
Shallow clay inspection chamber