Provision must be made to ensure uniform application of the nomenclature of the Common Customs Tariff with a view to classification of spray heads for fire extinguishing systems, consisting of a brass casing with a tube screwing into the conduit of the systems, sealed by a metal capsule held in place by a calibrated eutectic alloy inset which melts when heated, thus allowing the capsule to fall away, the water then spurting against a deflector plate under the head.
