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What is the opening size of the manhole?

Update:May 18,2023
Summary:What is the opening size of the manhole? The opening size is the opening size that needs to be cut on the manhole, also called the installation size.I......
What is the opening size of the manhole?
The opening size is the opening size that needs to be cut on the manhole,
also called the installation size.
It is usually slightly larger than the opening size of the product.
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