Small joints attached to the Quick Coupler are badly machined (female side) and can not be installed. The air leaked out. I tried the part that added the coupler together and there was no problem. If it is a severe thread mountain there is a possibility not to attach. Because it is cheap, it is giving up.
During painting work, change the airbrush frequently. When removing it I think that usability is good because the air does not leak. However, there is no durability of rubber packing inside the socket. It will cause air leak in about a year. I think that the price is high for the large consumable element. I think that the products of Anest Wakada have no durability of rubber packing in general. Airbrush needle packing is also intense.