A connector comprising a body (1) having a throughway (5) which is open at one end (4). A shoulder (8) in the throughway faces the open end and supports an O-ring (9). A collet (3) in the open end of the throughway has a plurality of legs (18) extending away from the open end, each engaging with the body and having an inwardly facing tooth to grip, in use, a tube in the throughway. The body has a plurality of fingers (11) extending to the open end. The connector further comprises a cap (2) fitting over the open end of the body and extending from the open end towards the opposite end. The cap has a plurality of recesses (23) in a wall at the open end into each of which a finger is retained by a snap fit.