A gas pressure regulator, comprising: a body fitted with a gas inlet stem, at a first end of the body, for receiving gas from a gas source at a first pressure, and a gas outlet stem or adaptor at a second end of the body, for supplying gas at a desired pressure at the gas outlet stem; a pressure adjusting mechanism to enable a user to adjust and set the desired pressure, the pressure adjusting mechanism comprising a movable piston arrangement; and gas regulating means, to regulate gas flowing out of the gas outlet stem to achieve the desired pressure set by the user, whereby the gas regulating means is securely fitted within the body so as to be located within a gas flow path between the gas inlet stem and the gas outlet stem, the gas regulating means comprising an encapsulated valve with a lever that can be actuated by the movable piston arrangement of the pressure adjusting mechanism, whereby the body includes: a first body component, to which the gas inlet stem, is fitted, the first body component defining an inlet chamber for receiving and accommodating gas from the gas source via the gas inlet stem; and a second body component, to which the gas outlet stem is fitted, the second body component defining an outlet chamber for delivering gas to the gas outlet stem, the first and second body components (28, 32) being securingly fitted together so as to sealingly secure the encapsulated valve between the first and second body components (28, 32), the encapsulated valve thus defining an interface between the inlet and outlet chambers (30, 34), the second body component further defining a venting outlet; characterized by a venting sleeve extending from the venting outlet defined in the second body component, the venting sleeve being in gas communication with the outlet chamber of the second body component, the venting sleeve defining at least one venting aperture to enable gas to vent if/when required; the movable piston arrangement incorporating a safety valve assembly, the piston arrangement being housed partially within the venting sleeve and partially within the venting outlet defined in the second body component, the piston arrangement comprising a guide flange secured between the venting sleeve and the second body component, with the piston arrangement being slidably movable relative to the guide flange between open and closed positions. a body fitted with a gas inlet stem, at a first end of the body, for receiving gas from a gas source at a first pressure, and a gas outlet stem or adaptor at a second end of the body, for supplying gas at a desired pressure at the gas outlet stem; a pressure adjusting mechanism to enable a user to adjust and set the desired pressure, the pressure adjusting mechanism comprising a movable piston arrangement; and gas regulating means, to regulate gas flowing out of the gas outlet stem to achieve the desired pressure set by the user, whereby the gas regulating means is securely fitted within the body so as to be located within a gas flow path between the gas inlet stem and the gas outlet stem, the gas regulating means comprising an encapsulated valve with a lever that can be actuated by the movable piston arrangement of the pressure adjusting mechanism, whereby the body includes: a first body component, to which the gas inlet stem, is fitted, the first body component defining an inlet chamber for receiving and accommodating gas from the gas source via the gas inlet stem; and a second body component, to which the gas outlet stem is fitted, the second body component defining an outlet chamber for delivering gas to the gas outlet stem, a first body component, to which the gas inlet stem, is fitted, the first body component defining an inlet chamber for receiving and accommodating gas from the gas source via the gas inlet stem; and a second body component, to which the gas outlet stem is fitted, the second body component defining an outlet chamber for delivering gas to the gas outlet stem, the first and second body components (28, 32) being securingly fitted together so as to sealingly secure the encapsulated valve between the first and second body components (28, 32), the encapsulated valve thus defining an interface between the inlet and outlet chambers (30, 34), the second body component further defining a venting outlet; characterized by a venting sleeve extending from the venting outlet defined in the second body component, the venting sleeve being in gas communication with the outlet chamber of the second body component, the venting sleeve defining at least one venting aperture to enable gas to vent if/when required; the movable piston arrangement incorporating a safety valve assembly, the piston arrangement being housed partially within the venting sleeve and partially within the venting outlet defined in the second body component, the piston arrangement comprising a guide flange secured between the venting sleeve and the second body component, with the piston arrangement being slidably movable relative to the guide flange between open and closed positions.