This cover has a smaller diameter than the radon dome cover. The OD of the larger radome dome was too large to fit on our swamp without hitting the walls. The water line fittings worked fine, but the radon pipe required a 3.5" hole to be drilled in the cap (the vent port was only 2"). I also installed a 4" top plate fitting that I could unscrew to look down the hole and check the float valves without removing the cover and attached plumbing. With the help of a radon fan and this cover, it was possible to reduce the radon to almost zero.
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