I was doing some drywall repair and pulled an old galvanzized pipe out of the wall, it was cut on both ends.

Im 99.9 percent positive it was a water pipe but what looked different to me was that there was a tee...the horizontal joint probably went into a cabinet for the cold supply. The vertical joint above that had another 6 or 8" and then it was capped. Looks like of like a drip leg on a water heater but only inverted 180 degrees.

Im guessing this was like a hammer arrester. Would a plumber made for such a provision 60 years ago?

yes

it was found they were virtually useless - they quickly became 'waterlogged' and did NOT empty when building was drained

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Yes he would have, but a better plumber would have made it at least 12", and preferably 18", long.

hj,


like this one?





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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Exactly, in fact I sometimes did use a 3/4x1/2x1/2 tee with a 3/4" air chamber on top.

Similar idea but in my case the line and the air chamber were 1/2" and there was no valves involved. It did come off a tee like its shown in picture though.

Thanks for posting.



Edited 1 times.

In that photo, why the extra valve for the air chamber?

if the valve has a drain button on it, you could shut the valve, open the drain button and loosen the cap periodically to 'recharge' the chamber.

So they could remove it and drain the water out without turning the water off in the building.

quote; you could shut the valve, open the drain button and loosen the cap periodically

The only way to drain it through that small port, would be to introduce air into the top of the air chamber by removing the cap. Loosening it would not work because the thread would need new sealant of some kind which could not be done if it were just loosened. Removing the chamber would be the same amount of work, but less time for the draining.



Edited 1 times.

hj,

how about a stop and waste for the bottom and a small petcock tapped into the cap ? !!!!!!!



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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

stop and waste at the bottom and a valve at the top.

A petcock screwed into a reducer would be a better idea.

where can I get a 2 x 1/4 coupling ?

once upon a time in a land far far away ..................................

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I cannot find the photo, but my memory thinks it was a 1" air chamber, not 2". 2x21/2" and a bushing or 1/2" hose bibb.

I was being facetious

however

our sponsor sell a 2x1/2 galv. reducer coupling !!

close enough

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638