"George" wrote in message
...
On 1/22/2013 8:31 AM, Existential Angst wrote:
Awl --

Ahm semi-re-plumbing the lines to the HW heater, and I noticed what
appears
to be some sort of vent/pressure relief ditty coming off the *CW inlet to
the HWH*. From the CW pipe to this gadget is copper, from the gadget to
the
wall is 1/2 black pipe. The 1/2 pipe goes thru an outside wall, altho I
have yet to find anything outside!

I'd be hardpressed to imagine that this thing still works, whatever it
was.
I'm sure it's 25++ years old.
It's not an anti-water hammering device, afaict. Is it safe to just
get
rid of this thing? City water pressure is barely 60 psi, I have gauges
plumbed into a couple of lines, very little variation.
It would make my life a lot easier if I could ignore/get rid of this
thing.


My guess is that it is the prolly regulator..

That would be "proly".....
--
EA