This is a type of hermaphrodite connection system with two interlocking connecting lugs.

Bizzy Fire Control offer a wide variety of fire hose adapters to meet the needs of the firefighting industry and we supply fire adapters in brass, chrome, aluminium, and polycarbonate from 1 to 6 inches.

What is an adapter?
Fire Adapters are plumbing fittings that allow fire hose couplings to be safely interconnected with couplings of varying sizes, threads, or mating surfaces. Adapters can also safely connect couplings to other appliances. In an emergency, fire adapters can help to save time by connecting mismatched hoses and couplings speedily. The images below show the different types that are available.