I am adding a 110mm non-return valve for my soakaway and want to build an inspection chamber for it as it's supposed to be inspected periodically. I looked at plastic options but couldn't see what I needed. Pipes usually stop at inspection chambers but I want this one to pass through, with the valve in the middle. How should/can I 'seal' around the entry holes? I know concrete can damage pipes as it expands/contracts, but I also know a lot of people use concrete. Can I just put mortar around the pipe entries? The pipes are PVC.
btw. the reason for the non-return valve is because I have a rainwater harvesting tank and I don't want the dirty soakway water flowing back into my tank. I have a high water table so it's likely that the water level in the soakaway will exceed the height of the rainwater tank overflow.
btw. the reason for the non-return valve is because I have a rainwater harvesting tank and I don't want the dirty soakway water flowing back into my tank. I have a high water table so it's likely that the water level in the soakaway will exceed the height of the rainwater tank overflow.