Outer Diameter: 800
Blinding Hole DesignBlinding Hole is in the main plate of manhole cover, can be ordered by user's requirements and can be installed with Vent Valve, Opic Sensor, Pressure Gauge, Dip Tube and External P/V vent.
Structure FeaturesThe main cover is made by plate punch forming, and the outer diameter can be ordered by users' demand. The hooped type installment mode is instead of traditional flanged type, it's more convenient and reliable to install.
