Assembly includes black air line with 3/8″ female plug at one end and 3/8″ female coupling at the other. For use with our plugs & couplings – you will also need a 1/4″ or 3/8″ male plug for attaching one end of the hose to the tool (depending on the thread of its air inlet) plus a 1/4″ or 3/8″ male or female coupling to attach the other end to the air supply outlet (depending on the type and thread of the outlet.) This will provide a complete solution from the compressor to the tool.