Abstract: Provided is a separator comprising a chamber having a chamber wall opening, and an inlet module comprising an attachment portion and a projecting portion, the attachment portion is coupled to the chamber wall and comprises an inlet for receiving liquid, the projecting portion comprises an outlet configured to create a circulating flow about a central axis of the chamber, the projecting portion is offset from the attachment portion, a first wall is formed between the projecting portion and the chamber wall, a second wall opposes the first wall, a first side wall and a second side wall oppose each other and connects the first and second walls, the second side wall is continuous and the first side wall defines the outlet, the outlet is directed tangentially with respect to the central axis and wherein liquid exits the inlet module in a tangential direction with respect to the central axis.

Abstract: 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.