These couplings can be used on Emergency & Service lines, with or without self-sealing valves. 'C' Air Brake Line Couplings & Air Brake Coil Hoses to DIN 74324 / 73378 Specification for Tractors, Trucks & Trailers. Specifications: Thread Type: Female Thread Size: 1/2" BSP Fitting Type: C Male Coupling Corrosive resistant finish: IR7G Manufactured in Great Britain (UK) Made to British Standard, BS AU 138a:2000. Weight: 0.220462262 Pounds. Manufacturer: AB Tools