Mainline Backflow Products (Can) Inc.
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Mainline - Model ML-BB3430 -Bladder Seal
Protects against radon gas & easily integrates with your vapor barrier system. Seals against groundwater flooding through box.
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Bugs/Insects
Seals against insects/bugs from entering building through valve box
Clean Valve Access
Ensures nice clean valve access free of concrete, gravel, sand, mud and water over valve