A water fitting housing comprising: a main body section having first and second ends and a first channel connecting the first and second ends, wherein the main body section includes a wall and an inner tube, wherein the main body section defines a first flow path between an inner surface of the wall and the inner tube, and a second flow path inside the inner tube; a first attachment arrangement located towards the first end of the main body section; and a second attachment arrangement located towards the second end of the main body section, wherein the first attachment arrangement is suitable for connection to a water meter manifold and the second attachment arrangement is suitable for connection to a water meter, such that water drawn through an external cavity of a coaxial pipe section of the water meter manifold will flow through the first flow path of the housing, and water which has passed through the water meter and through an internal cavity of a coaxial pipe section of the water meter will flow through the second flow path of the housing and into an internal cavity of the coaxial pipe section of the water meter manifold, and wherein the first attachment arrangement is suitable to be attached to an attachment member which is substantially identical to the second attachment arrangement characterised by: a rotor member located at least partially within the main body section of the housing and including at least one magnetic element configured to be driven by a flow of fluid through the housing; and a stator member located with respect to the rotor member such that rotation of the or each magnetic element induces an electrical current in the stator member to generate electrical power. a main body section having first and second ends and a first channel connecting the first and second ends, wherein the main body section includes a wall and an inner tube, wherein the main body section defines a first flow path between an inner surface of the wall and the inner tube, and a second flow path inside the inner tube; a first attachment arrangement located towards the first end of the main body section; and a second attachment arrangement located towards the second end of the main body section, wherein the first attachment arrangement is suitable for connection to a water meter manifold and the second attachment arrangement is suitable for connection to a water meter, such that water drawn through an external cavity of a coaxial pipe section of the water meter manifold will flow through the first flow path of the housing, and water which has passed through the water meter and through an internal cavity of a coaxial pipe section of the water meter will flow through the second flow path of the housing and into an internal cavity of the coaxial pipe section of the water meter manifold, and wherein the first attachment arrangement is suitable to be attached to an attachment member which is substantially identical to the second attachment arrangement characterised by: a rotor member located at least partially within the main body section of the housing and including at least one magnetic element configured to be driven by a flow of fluid through the housing; and a stator member located with respect to the rotor member such that rotation of the or each magnetic element induces an electrical current in the stator member to generate electrical power. a rotor member located at least partially within the main body section of the housing and including at least one magnetic element configured to be driven by a flow of fluid through the housing; and a stator member located with respect to the rotor member such that rotation of the or each magnetic element induces an electrical current in the stator member to generate electrical power.