Washer Standpipe Draining Slow and Then Overflows

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South New Jersey
Hello everyone!

I finally made it at a point in my life where I now care about plumbing! I look forward to reading, learning and asking questions! Took only half my life.

REASON: Long story short, mom had 2 strokes and now I need to make a laundry room for her so she doesn't have to go to the laundromat. So now 14 years later I'm now installing a washing room area for her.

ISSUE: The picture attached is the p-trap (I'm guessing) that leads to the city sewer. This is the novice work that I did. I learned that I need a vent attached because when I put the washer hose in the water drains to slow and cant keep up with the amount of water being discharged.

MY DIY ATTEMPTS: I looked everywhere online and couldn't find a diagram with my trap and y adapter and vent solution. I went to a local plumbing store and the man was helpful but he did admit he wasn't a plumber. Plumbers were available but it seemed they didn't want to help. So I bought a air vent, 2in PVC pipe 5ft and a y adapter, 3 in and 2 in rubber adapters for cast iron to PVC and 2in coupling

QUESTION: How can I rectify this problem with what I already bought? Do I cut the cast iron pipe? Do I install the y adapter and vent at some point after the P trap or before? Should I just increase the PVC pipe size and height to allow the discharge water room to accumulate and drain?

Thank you for taking the time to read. I look forward to any advice and suggestions.


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