A release tool for use with a push-fit valve, the valve having a valve body defining a valve passage and a grab ring for retaining a conduit in fluid connection with the valve passage, the release tool comprising: a fixed member configured to be affixed to the valve, the fixed member comprising: a central portion defining a base aperture configured to receive therein a lever base of the valve, the base aperture being shaped such that, when the lever base of the valve is received in the base aperture, the central portion is rotatably fixed relative to the valve; and at least one guiding arm extending from a side of the central portion so that the at least one guiding arm extends along a side of the valve body when the release tool is mounted to the valve; and a movable member movably connected to the fixed member, the movable member being movable relative to the fixed member between a first position and a second position, the movable member defining: a conduit aperture configured for the conduit to extend therethrough during use, the conduit aperture being shaped and sized so as to permit the movable member to abut a release collar of the valve during use; and at least one guiding aperture receiving the at least one guiding arm of the fixed member; wherein, during use, in order to disconnect the conduit from the valve, the movable member is moved from the first position to the second position to push the release collar inwardly into the valve and thereby cause the grab ring of the valve to release the conduit, the movable member being selectively retained in the second position via interaction between the movable member and the at least one guiding arm. a fixed member configured to be affixed to the valve, the fixed member comprising: a central portion defining a base aperture configured to receive therein a lever base of the valve, the base aperture being shaped such that, when the lever base of the valve is received in the base aperture, the central portion is rotatably fixed relative to the valve; and at least one guiding arm extending from a side of the central portion so that the at least one guiding arm extends along a side of the valve body when the release tool is mounted to the valve; a central portion defining a base aperture configured to receive therein a lever base of the valve, the base aperture being shaped such that, when the lever base of the valve is received in the base aperture, the central portion is rotatably fixed relative to the valve; and at least one guiding arm extending from a side of the central portion so that the at least one guiding arm extends along a side of the valve body when the release tool is mounted to the valve; and a movable member movably connected to the fixed member, the movable member being movable relative to the fixed member between a first position and a second position, the movable member defining: a conduit aperture configured for the conduit to extend therethrough during use, the conduit aperture being shaped and sized so as to permit the movable member to abut a release collar of the valve during use; and at least one guiding aperture receiving the at least one guiding arm of the fixed member; a conduit aperture configured for the conduit to extend therethrough during use, the conduit aperture being shaped and sized so as to permit the movable member to abut a release collar of the valve during use; and at least one guiding aperture receiving the at least one guiding arm of the fixed member; wherein, during use, in order to disconnect the conduit from the valve, the movable member is moved from the first position to the second position to push the release collar inwardly into the valve and thereby cause the grab ring of the valve to release the conduit, the movable member being selectively retained in the second position via interaction between the movable member and the at least one guiding arm.