Take a look at this pipe:
I need to flip the U-bend on the right hand side round, and take the
flow out into another pipe. Can I unweld any of those joints or are
the absolutely permenent?
If I can't, then the only thing I can think of is to cut the pipe at
the bottom of the short straight length of pipe (there's around 2
inches there to play with) that goes into the right hand side of the U-
bend. Then cut off the U-bend and stop it, and add another U-bend the
other side. Sound ok?
If you can sacrifice the outer part (the U-bend here), it usually can be
cut and carefully peeled off, and the remainder cleaned up for re-gluing.
PVC pipe solvent "welding" is not really welded, just glued with solvent
No. "Welding" is the fusion of the same materials. PVC cement is not PVC,
so it is not at all like welding, because the joint filler material differs
from the bulk material. More like brazing or soldering, if you want to
That requires cutting off the fitting to begin with. I really have
never seen a reason to do that other than to fix a pipe that has
broken at the fitting. Given room to work, just cut out the problem
and replace. Those fitting are in the 'cheap' range.
DWV pipe can be either black ABS or white PVC depending on the code for the
local jurisdiction. Much of the US uses PVC, here in Ontario, Canada ABS is
mandated but PVC is used for underground piping which makes for some
Interesting to note that when Home Depot opened here in Canada, the first
time I visited a store they had only PVC DWV piping, which was illegal. This
didn't last, but it took a couple of weeks before they actually replaced
their stock with ABS.
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