Specifies requirements for metallic through-hull fittings, seacocks and hose fittings that specifically form part of water intake and discharge lines, and for wet exhaust outlets used in small craft of up to 24 m length of hull. Applies to seacocks and through-hull fittings with cylindrical pipe threads in accordance with ISO 228-1, and with joints for conical pipe threads in accordance with ISO 7-1 with nominal diameters of 1/4, 3/8, 1/2, 3/4, 1, 1 1/4, 1 1/2, 2, 2 1/2, 3 or 4 in.