Hello. Our shower has a Delta faucet with a single handle. This was
an upgrade from a tub to a tub and shower so the diverter is not on the
spout but just below the handle. Recently we've experienced a drop in
water pressure as you call for more hot water. This happens whether
the water is going thru the shower head or the spout. For a laugh I
took the head off and soaked it in vinegar. Didn't make a difference
not that I expected it to. All the valves in the basement are open.
The sink gets good hot water pressure. Seems like it's the valve. I'm
not much on plumbing. How difficult is it to replace a valve like
this? Or could it be something else? Any thoughts?? Thanks.
does your delta have the anti-scald feature?? if so its probably that spool
partially plugged up or not moving. If you do not have that feature its
probably the piece behind the handle (cartridge) its all in one piece and
shud take 5 minutes afer you shut the water off
not knowing your exact model you shud turn off the water remove the
handle(set screw or a screw right in the middle under the plastic cap) and
you shud see a ring that you remove and under that once removed a cartridge.
behind that you shud see maybe a couple of rubber washers with springs
behind them and shud be included with your kit, remove and replace them and
slip the cartridge in , replace the ring and tighten it down, replace the
handle and turn the water back on.
if its got the antiscald it could be off to the left or right and have a
screw head or a hex head for removal. Its pupose is to stop scalding when
someone gives a flush while you shower and it meters the hot water with the
Good morning. Well I took the knob off of the faucet abd this is what
I found. There is a crome dome shaped cover. Under that the, valve is
a ball and socket. The ball has two sets of three holes. I couldn't
find anything in it that might block the water. Inside the socket
there were three holes like a bowling ball. The larger one is at the
bottom. The other two are smaller and have rubber ring washers. Again
I didn't see anything in there. I poked around in there with a pipe
cleaner. Still nothing. Once I reassmbled everything I still had
little hot water pressure. I'm thinking it can be one of two things.
Something with the diverter though I don't know what. Or it's the
pipes. They are old galvanized pipes. House was built in 1924.
Pressure is fine at the sink which is supplied by the same pipes. But
I'm thinking the sink doesn't call for the same amount of water. Am I
I just had a similar issue with the hot water in the bathroom sink.
Shower was OK. I messed around for a few hours trying to backflush the
galvanized pipe, replaced the 4" nipple that collapsed from rust, etc.
I ended up having to replace the pipe back to the water heater with
copper. This was a 1950s vintage house and you could not see light
through a 4" section of pipe it was so corroded.
It is probably the galvanized. If you have already checked the faucet
and other easy things, it is probably time to replace some pipe,
especially at 80 years old.
Here's the kicker. I replaced the galvanized pipe from the basement to
the second floor where the bathroom is. Actually I had someone do it
for me. I didn't go across to the tub because when the house was built
the pipes were imbedded into the mortor of the bathroom floor. I
figured if I tried to remove them I'd lose the floor. At the time
water pressure wasn't an issue. I kind of think I'm stuck.
You just checked the LEAST likely cause. Now go back and check the
anti-scald spool. There are also "screw" adjustments for balancing hot
and cold water volume. They are located in the horizontal part of the
casting, as is the anti-scald chamber.
From what you described originally, you have the bog standard Delta anti-scald
shower fixture. If you remove the plastic knob, and the large round 6" bezel
behind it, (two screws) you will have access to the whole enchilada. To the left
of center will be a short valve stem with a slot in the end for a screwdriver.
That's one of the water valves, on the right of center will be another of the
same thing. One is hot water and the other is cold. On the right side there is
also a "bulge" that has a screw-in cap. Inside that cap is the anti-scald spool
that gets stuck. Remove the cap, extract the spool and drop it in a cup of
vinegar for an hour. It needs to be able to move about completely freely in the
hi i was having the low hot water problem just today and found this page ,
after tearing apart my delta apart i eventually found the problem was not
in the cartridge at all but a slug of calcium / lime that had built up
at the back end of the "hot" hole that the cartridge fits into "top
right on mine" after some deft work with a drywall screw and some
tweesers i got it out and did a 10 second flush with the cartridge out
"carefull here have someone hold the shower curtain to the wall lest you
end up with a very wet bathroom"
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