This bushing is a must have for sub-slab depressurization systems.
The seal has a little lip inside that the pipe edge rests on - an extra safety step to stop the pipe from sliding into the suction pit.
An added bonus is how it keeps the contact point between the pipe and the slab nice and clean looking.
This bushing fits a 5" cored hole in the slab and 4" schedule 40 pipe.
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