I'm looking to install a store-bought water hammer arrestor at the faucet,
without soldering. For this, I would require an adapter that goes from the
3/8 inch compression thread that is common on faucet shut-offs (where I
would tee off to attach the arrestor) to the 1/2 inch pipe thread that the
adapter has. Problem is, such an adapter does not appear to exist, or
at least, none of the stores in my area carry one.
Anybody ever install a water hammer arrestor this way? How did you do it?
Get a 3/8" Compression TEE.
Insert that in-line.
Then, get a 3/8 compression X 1/2" ips (PIPE) adapter.
Use a short stub of 3/8" tube to go from TEE to adapter.
Those items should be available at the Big Box or at a decent hardware
Putting a tee inline (in the tube going to the faucet) won't work, as
it is the kind that is covered with a stainless steel braided sleeve.
I did find a tee that inserts between the tube and the shutoff valve
(its advertised purpose is to branch two lines off a valve that only
has a connection for one), however that then leaves me with the problem
that there appear to exist no adapters for going from this 3/8" thread
to the 1/2" pipe thread.
for some selections.
If you put the TEE after the valve, your braided supply line will
(should) fit the TEE.
Adapter from 3/8" tube to 1/2" IPS is a common item.
I wasn't imaginative enough, it turns out. While HD and OSH don't have
a brass adapter for my purpose, they do sell 12 inch lenghts of tube with
those connectors, normally used to hook up a faucet. That, combined with
a 3/8 tee, worked just fine.
The bad news is that the addition of the water hammer arrestor didn't stop
the banging in the water heater when turning off the hot water. I'll try
again tonight with a simple air chamber, in case the piston in the
arrestor got stuck or something.
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