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My kitchen sink drain is slow. The drain became slow at about the same time I realized I needed to replace the main pipe leading to the stack. I thought that I’d find the problem while doing the repair but there was no clog. I replaced everything between the strainer and the stack. While is had stuff off I snaked the vertical and ran water down with a hose with no problem. There is good slope all the way so I can’t figure out why it’s slow. My best guess now is a clogged vent (this is the only fixture that uses this vent). Could that be it or should I look elsewhere?