The fire-proof air-permeable cap (or air-permeable cap) is an important equipment to ensure the air-permeable safety of gas station, oil tank and so on.

Pressure vacuum relief valves (also known as breather valves) are used to prevent the build up of excessive pressure or vacuum in liquid bulk storage tanks.

Explosion-proof fire arresters are one of the types of fire arresters used to prevent the flame spread of flammable gases and liquids and to prevent the explosion caused by tempering.