Abstract: A drainage assembly (10) comprising a cylindrical outer body (11) and cylindrical basket (12) have co-operating threads (13 and 14). a slotted flow though lid (15) is hinged at (16) to the body so that the lid (15) may be lifted to gain access to the basket (12). A centrally located cross bar (17) allows the basket to be rotated automaticall moved axially in the direction of the arrow (18) to remove the basket from the assembly and release a basket actuated valve member (19) biassed by biassing spring (20) to close off annular drainage opening (21) when the basket (12) is removed. A ball valve at (25) may be used to shut off flow through the assembly manually using a ball valve actuator (26) independently of the basket.