When draining kitchen sink, water backs up the second sink, slow to go down. I checked the trap and the lines going to trap, all clear.

Have u run a snake from trap into wall?

I sink vented?

Chuck

Yes the sink is vented, and checked trap, and line going to wall is good.

Hi simmy and welcome to The Plumbing Page at AskMeHelpDesk.com

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I checked the trap and the lines going to trap, all clear.

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The next step would be to snake the line in the wall, Remove the "J" bend from the trap and send a snake up into the wall. You'll hit a bend about 8 in but once past that you'll only have 6 more feet to go. Flush with a sink full of hot water. Good luck, Tom