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Installing double sink vanity

I'm also installing a double sink vanity where there was only a single. My question is about the drain. The vanity has drawers in the middle with two openings on the back for plumbing. I have the wall open going to the stack/vent. Can I run that single drain line to both sinks without a separate vent. I was planning on installing a trap under each sink but I saw an article that said there might be a siphoning effect for the downstream trap. Not sure if that's true or not. I really don't want to disabe that center drawer or tear open more wall to tie in another vent since it is cast iron. Any help would be greatly appreciated.
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Posted 2018-07-13T16:48:37+0000  by Floyd57 Floyd57
You could create a siphon effect, although most people don't put that much water down a bathroom sink.  Replace the existing fitting with a double Wye or add an air admittance valve.  The later would probably be easier.
Posted 2018-07-14T01:52:14+0000  by Adam444
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