MTM Hydro M22 Twist Seal Couplers connect items such as your hose with M22 fittings to your spray gun, or an extended lance to an accessory.
These M22 Male Couplers can only accept an M22 plug with a 14mm stem (on the black side) and are sized 1/4" and 3/8" for the conversion into Male plated steel NPT threads.