(1) Every landing-valve required by section 50 shall be an approved gun-metal, wheel-valve pattern landing-valve having an inlet for a supply-pipe of not less than 75 millimetres in internal diameter, and a female outlet of not less than 65 millimetres in diameter.

(2) Such wheel-valve shall have embossed or engraved thereon the word “OPEN”, and an arrow indicating the direction of rotation of the wheel to open the valve.

(3) Where such landing-valves are required to be provided in any storey, they shall be provided at the rate of not less than one landing-valve for every 600 square metres, or remaining portion thereof, of floor area of the storey concerned, but every such landing-valve shall be so located that all parts of such floor area can be reached by a jet from the hose with which it is provided

(4) Where landing-valves are required to be provided in a building and to serve any storey at a greater height above ground-floor level than 11 metres, a twin-inlet fire-pump boosting-connexion, fitted with a reflux-valve and a pressure-gauge not less than 100 millimetres in diameter, reading up to 1 400 kilopascals, shall be provided within 1 metre of the finished ground-level in an approved position on an external wall of such building.

(5) The water-supply pipe to every such landing-valve shall have a nominal bore of not less than 80 millimetres, and be independent of the domestic water-supply to the occupancy-unit served by it, and shall be connected directly to a water-main of the local authority.

(6) Every building exceeding 18 metres, but less than 30 metres in height, in which such landing-valves are provided, shall have a water-storage tank or interconnected tanks of an aggregate capacity of not less than 6 cubic metres, in addition to any domestic reserve, if there are one or two landing-valves in each storey, or not less than 9 cubic metres, if there are more than two landing-valves in each storey.

(7) The bottom of any water-storage tank referred to in subsection (6) shall be—

a) not less than 4,5 metres above the level of the highest landing-valve in the topmost storey of such building, and shall be connected to the landing-valve supply-pipe through a pipe having a minimum nominal bore of 80 millimetres and fitted with a stop-valve and a reflux-valve; or

b) above the ceiling of the topmost storey or above the eaves-level of such building, and shall be directly connected through a pipe, having a minimum nominal bore of 80 millimetres, to the fire-pump boosting-connexion mentioned in subsection (4).

(8) Such tank or tanks shall be fitted through a pipe, having a minimal bore of 20 millimetres, connected to the landing-valve supply-pipe and fitted with a stop-valve and a high-pressure ball-valve.

(9) As an alternative to wet rising mains, the local authority may require dry rising mains fitted with fire-brigade inlets and approved outlets, which shall comply with subsection (1) and be provided at the same rate as required in subsection (3).