The paint container on top of the spray gun provides an excellent weight balance, ensuring the gun fits in the hand. The gun is 15% lighter than the previous model in total mass.Even coating is provided with water-based and high solid types of paint as well for which atomizing has been difficult to realize.W-400 reduces the atomizing air pressure (at the gun handle) by 0.05 MPa to 0.15 MPa, which enables this general-purpose spray gun to provide high transfer efficiency.