Hose couplings are used to firmly and reliably connect hoses to various types of water and pressurized air outputs. They may be found in a variety of commercial, industrial, and household contexts. Solid (flour, sugar, etc.), liquid (including chemicals and hydraulic oils), or gaseous media can flow through them (including compressed air). This apparatus is made of metal to last longer than your average hose couplings.
A male adapter has the threading on the outside of the hose fitting, while the female adapter has the threading on the inside of the hose fittings.