Plugging Sewer Pipe That Is To Be Retired

personalt

I am doing some excavating on a job where I exposed two old 4 inch sewer pipes entering the house through the foundation wall.

I normally leave it for the plumber to cap but he takes this week for vacation. The plumber is doing new mains so we cut this back to right where it enters the foudation.

I have a 4 inch test plug in there now but what is the best way to retire this pipe good? The plug is doing an okay job but because the pipe isnt in the greatest shape during the last rain the backed up sewer water pushed past and flooded the site.

do I just cap this with a rubber cap or do I fill the end of the pipe with something?

jmic

Person,
You didn't mention what kind of pipe it was, in any case I'd clamp a 4" fernco cap on it, you could also mix a little concrete and pour over after installing the fernco but I really don't see a need for it.

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Joe

personalt

4" cast iron. The issue with the fernco is that the pipe is got so much crude on it, the pipe isnt really round.

When I did a switch from cast to PVC in my house I hit it with the grinder to clean it up but that was a pain in the ***.

Is there something that could go inside to plug it? ie stick a rag light material inside and push it maybe a foot down and then put concrete in the pipe? The only issue with that is I would almost have to drypack it since it would otherwise just leak out.

Gmads

You could use a 4" butterfly plug. It fits inside the pipe. Picture an oreo cookie with a bolt thru it and a butterfly nut. Tighten the butterfly nut by hand and it will squeeze the filling (rubber gasket) to seal with the inside of the pipe.