A separator (10) comprises a housing (12) and a separator chamber (24) contained within the housing, an inlet (26) and outlet (28) to the separator chamber and a dividing member (34) for substantially dividing the separator chamber into a first chamber (30) and a second chamber (32). A flow path (38) is provided between the first and second chambers for allowing flow to circulate between the first and second chambers, and guide means (56) for creating opposing flow paths in the second chamber (32) for slowing flow through the second chamber (32).