A separator comprises a gully chamber 2 having inlet and outlet ducts 10,
12. Inlet and outlet housings 20, 22 are disposed within the separator
and are connected by a bypass duct 24 which extends around the wall of
the chamber 2. Flow enters the chamber through an inlet which is oriented
to create a circulating flow. Flow exits from the chamber through an
outlet opening provided in the outlet housing 22. The outlet opening is
oriented in the direction of the circulating flow so that liquid has to
reverse from that flow to pass through the outlet opening. The inlet and
outlet housings 20, 22 are made from identical mouldings in which
appropriate openings are formed. The bypass duct can be cut to length to
position the inlet and outlet housings 20, 22 opposite existing inlet and
outlet ducts 10, 12.