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Kieth, the pro vent pictured is about as cheap as they come and most plumbing codes won't allow the pro vent. I run a plumbing wholesale company and while our local code does not allow the version pictured , they typical overlook the code and allow its use for a single sink. The cheaper Pro Vents fail constancely and I sell a ton. Oatey Mfg markets a very good unit called Sure Vent and there is always the old faithfully original Sutdor Vent. Steve
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