This particular adapter has an M22 Twist Coupler (Black side) with 14mm stem converted into a standard 3/8" QC Plated Steel Plug. It can be found on Spray Gun inlets, Pump outlets, or even in conjunction with other adapters for a more complex change of fittings.

This item is commonly paired with the 24.0481 when converting a Sunjoe, AR, Ryobi or Greenworks machine into a QC setup at the gun-to-hose joint.