© Whole diameter: 16″

In the main plate of the manhole cover, There are two blinding holes an be installed with Optic Sensor, Dip Tube or External Vacuum Valve 4 al 0 according to user’s demand.


© Benefit and Features:

Aluminum alloy surface is treated
by oxidation to improve the anti-
corrosion; It made by new type platen,
can open the fill cover by bigger angle.
Can be installed double P/V vent
valve according to requirement to
increase the flow rate of air.


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