The air leakage of the dust blowing gun is mainly a problem of the sealing valve. The inferior dust blowing gun is often sealed with a plug and an O-ring seal. The advantages are cheap price, high profit, and large sales. Domestic customers are very sensitive to price, quality and price. Often only choose the price.
Good size guns are to be air-tight, and they are all double-piston type, and the seals do not use O-rings. The warranty will be more than half a year, like Japan’s Weikilong, Taiwan’s Valley, and the US’s Coson. Total warranty.
It is relatively simple to identify good and bad size guns. The shape of the dust blower is very simple. Even if the good air-tight gun removes the handle, piston and other detachable parts, it will not leak under the ventilation state. It's so magical. . . Buy a dust blower or a brand, manufacturers, the price difference is a few cents, and the quality is several times different.
Cheer for the quality of China!