Abstract: A valve 1 suitable for use on an indwelling catheter is disclosed. Broadly the valve 1 comprises a valve housing 2 having an elongate valve insert 3 disposed therein. The housing 2 has an inlet 4 at one end thereof and an outlet 5 at an opposed end thereof and defines a longitudinal passage 7 extending from the inlet 4 to the outlet 5. The valve insert 3 includes a cannula 25 having an inlet 26 towards one end 27 thereof and an outlet 28 towards an opposed end 29 thereof. The inlet end 27 of the cannula 25 terminates in a sharp point. The outlet end 29 by contrast is rounded and the actual outlet 28 is spaced axially inwardly from the end 29. The valve insert 3 further includes a seal 40 comprising an annular body 41 of resilient material defining an opening 42 therein through which the outlet end 29 of the cannula 25 projects. The seal 40 has an axial end surface which sealingly engages a seat 19 defined by the housing 2.