What is this?

347

Hello All,

I am on a job on the north shore of Long Island. It is installed after the housetrap before the main 4" waste stack for two second floor bathrooms but before a slop sink and washing drainpipe in the basement.

Any help would be appreciated.

Thank you 

Alan (California Radiant) Forbes

Grease trap.

Jamie Hall

And clean it out. Which won't be any fun at all….

Larry Weingarten

Hi, Good chance you'll want some ventilation going when you open it up. Who knows, maybe that long-lost gold ring is in there 🤩

Yours, Larry

4GenPlumber

That looks like a separator (probably not for grease), also not after a house trap. If that's the kitchen and laundry going into it, its like a gray water tank, but tied into the sewer...weird. pour some bleach into the laundry tray before opening it, and take pics when its opened.

hot_rod

Looks like a plaster trap (solids interceptor) possibly. They were used at some sinks in medical facilities.

Or a pottery person lived there and used the sink for clean up?

Or a grease trap.