A connector (10) or kit of parts facilitates sealingly inserting a plumbing member (211) into a gap (250) created in an existing pipeline (200). The connector (10) comprises a bridging sleeve (12; 212), a first sealing device (14; 214), a second sealing device (16; 216), a first sealing element (18; 218), and a second sealing element (20; 220). In use, the first sealing device (14; 214) is adapted to form a first seal between a bridging sleeve (12; 212) first tubular section internal surface and an existing pipeline external surface (252, 254) by compression of the first sealing element (18; 218) and the second sealing device (16; 216) is adapted to form a second seal between a plumbing member internal surface and a bridging sleeve second tubular section external surface (24) by compression of the second sealing element (20; 220).