I have a sink in my basement that is hooked up to a 2.5" drain pipe that
goes to the septic tank that is no longer used. I want to cut the pipe
flush with the wall and seal it up. The pipe is probably from when the
house was built in 1935. Can it be welded? If not I can cut a steel plug
and epoxy it in the pipe, unless someone has a better idea.
It matters a great deal as to what the pipe is made of and what
it is doing.
It sounds like sanitary sewer, but has it been open all these
years or is it plugged now? If so, how is it plugged?
It could very well be a piece of galvanized pipe threaded into a
cast iron fitting. Remove galvanized nipple, replace with
It could be cast iron - no you wouldn't weld it. The very best
would be to pop out the sanitary t and replace with straight pipe
(pretty good size job)
DIY is great, but this one may be time for a plumber.
Keep the whole world singing . . . .
Probably cast iron so no welding except by an expert.
Cut flush, plug with mortar or cement pre-mix. May have to add a
bead of caulk around the perimeter of the plug as mortar and premix
shrink slightly as it dries.
That is going to be cast iron and difficult to weld. It could be
brazed, but it would be simpler to plug it this way;
Stuff some fiberglass insulation down into the pipe about 6" or so.
Fill the cavity above the insulation with non shrink grout. Do whatever
you want to finish off the repair, but while the grout is drying, you
can slip a screw anchor into it to receive the screw for a cover plate,
if you want.
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