AILE VV-A-801 2” NPT THREAD FOR DIESEL (NO PRESSURE)
AILE ’S Pressure Vacuum vents are installed at the top of vent pipes from underground or aboveground fuel storage tanks. The vent cap and internal wire screen are designed to protect the tank vent lines against intrusion and blockage from water, debris or insects. A normally closed poppet in the valve opens at a predetermined pressure or vacuum setting to allow the tank to vent.
Note: W-VR is used for Vapor Recovery System of Petrol Station
Brochure:
https://neobros.com.ph/sites/default/files/Shanghai%20AILE%20Service%20Station%20Parts%20%281%29_0.pdf