"Weak flushing?" Whatever you mean by that has nothing to do with the supply
pipes. Maye "slow filling" of the commode tank, but nothing having to do
with flushing itself.
So where is this "low cold water pressure" and how was it determined. A
partially blocked pipe does not affect the pressure - flow rate maybe, but
I'd start by examining the faucets.
If the old galvanized pipes corroding are the problem, which is very
possible, then I think you're wasting your time trying to track down
which exact section of pipe it may be. I can see perhaps if there is
one section that is much older than the rest and easier to access, but
if it's all about the same age, then it all should be replaced.
Trying to find 2 ft that might be worse right now, even if that's
possible, only to have to replace more next year doesn't make any
sense to me. Plus you then have to deal with connecting the old
galvanized, which is failing, to new copper.
just install PEX its cheap, very reliable and easy to work with.
we have half inch copper to our bathroom. if someone is showering and
flushes scald is result:(
so I am about to run new PEX both hot and cold from the hot water
a hundred feet of PEX is under 70 bucks. change it all it will be so
easy you can eventually replace all your galvanized lines
The OP may be in California which does not generally allow PEX. Seemingly,
PEX is made from whale blubber or DDT or might someday be made with either
of those materials or may leach noxious chemicals into the environment or
start a grass fire or somesuch.
Here's some background.
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