A plumbing fitting comprising: a cap; and a body comprising a fitting end that is configured to be received by the cap, the body comprising a first engagement projection and a second engagement projection that are circumferentially spaced apart from each other and that extend radially outwardly from an outer circumferential surface of the fitting end; wherein the cap comprises: a first tab and a second tab, each tab having a free end (17, 19) at a receiving end of the cap; the first tab comprising a first receiver that is configured to receive the first engagement projection and the second tab comprising a second receiver that is configured to receive the second engagement projection; wherein the tabs (13, 15) are configured to permit flexure of each tab relative to the other; and wherein each tab (13, 15) comprises a radially inwardly extending spacer member (27, 29) at the free end (17, 19) of the tab (13, 15); wherein the spacer members (27, 29) are configured such that, as the fitting end is received by the cap, the free end (17, 19) of each of the tabs (13, 15) is displaced radially outwardly so as to space apart an inner circumferential surface of the tabs (13, 15) from the outer circumferential surface of the fitting end, thereby providing clearance for receipt of the engagement projections (7, 9) by the receivers (23, 25). a cap; and a body comprising a fitting end that is configured to be received by the cap, the body comprising a first engagement projection and a second engagement projection that are circumferentially spaced apart from each other and that extend radially outwardly from an outer circumferential surface of the fitting end; wherein the cap comprises: a first tab and a second tab, each tab having a free end (17, 19) at a receiving end of the cap; the first tab comprising a first receiver that is configured to receive the first engagement projection and the second tab comprising a second receiver that is configured to receive the second engagement projection; wherein the tabs (13, 15) are configured to permit flexure of each tab relative to the other; and wherein each tab (13, 15) comprises a radially inwardly extending spacer member (27, 29) at the free end (17, 19) of the tab (13, 15); a first tab and a second tab, each tab having a free end (17, 19) at a receiving end of the cap; the first tab comprising a first receiver that is configured to receive the first engagement projection and the second tab comprising a second receiver that is configured to receive the second engagement projection; wherein the tabs (13, 15) are configured to permit flexure of each tab relative to the other; and wherein each tab (13, 15) comprises a radially inwardly extending spacer member (27, 29) at the free end (17, 19) of the tab (13, 15); wherein the spacer members (27, 29) are configured such that, as the fitting end is received by the cap, the free end (17, 19) of each of the tabs (13, 15) is displaced radially outwardly so as to space apart an inner circumferential surface of the tabs (13, 15) from the outer circumferential surface of the fitting end, thereby providing clearance for receipt of the engagement projections (7, 9) by the receivers (23, 25).