Abstract: A hose coupling of a simple construction is disclosed which is capable of attaining airtight or watertight connection of a hose to a coupling body, effective prevention of disconnection of the hose therefrom in use, and disconnection of the hose therefrom at the time of exchange.The hose coupling includes an O-ring, a holding ring for securely holding a hose to the coupling, and a collar for releasing engagement between the hose and the coupling which are arranged in a fluid passage of the coupling. The holding ring and collar are held in position by means of expansion spring rings.

Abstract: A hose fitting which comprises a body having a longitudinal fluid passage adapted to receive a hose, an O-ring provided in the fluid passage so as to give water- or air-tightness to a space formed between the outside surface of the hose inserted in the fluid passage and the surrounding wall thereof, a quick hose-disconnecting mechanism provided between the O-ring and the outlet of a fluid passage for gripping the hose in such a manner as to prevent reverse motion and disconnecting the hose by the aid of a single manual pressing operation, and a rotary joint provided rotatably at the inlet end of the fluid passage and adapted to be connected to a fluid supply source.