• Whole diameter:20″
• Blinding Hole Design:

In the main plate of the manhole cover , There are three blinding holes can be installed with Vapor Vent Valve , Optic Sensor , Dip Tube or External Vacuum Valve according to user`s demand.

• Benefit and Features :Aluminum alloy surface is treated by oxidation to improve the anti-corrosion.

Can be installed double P/V vent valve according to requirement to increase the flow rate of air

Emergency open presure: 21Kpa~32Kpa

Max Emergency Flow Rate: 7000m³/h(When 34Kpa)

Material: Aluminum Alloy

Installment Mode: Flanged Type

Temperature Range: -20℃~+70℃

Model: C801A-460

D0: Ø560

D1 Ø530

D2 Ø482

H 88

B 12

Z-d 24-Ø11