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HVAC gopher
12-19-2008, 12:14 PM
Hello! New to the forum and I am need of help!

I am looking for a 3 1/2" black union. No one manufactures the part any longer. A manufacturer of black fittings suggested the makeshift repair of using bushings to make a 4" black union work - but that would make a loud hammer effect.

Any suggestions?
homeowner12345
12-19-2008, 12:43 PM
Hello! New to the forum and I am need of help!

I am looking for a 3 1/2" black union. No one manufactures the part any longer. A manufacturer of black fittings suggested the makeshift repair of using bushings to make a 4" black union work - but that would make a loud hammer effect.

Any suggestions?

Willing to use stainless steel? Some guy on eBay has three of them at a BuyItNow price of $10.00. Take a look at http://cgi.ebay.com/3-1-2-ss-Female-3-pieces-unions_W0QQitemZ140210268793QQihZ004QQcategoryZ264 19QQssPageNameZWD1VQQrdZ1QQcmdZViewItemQQ_trksidZp 1638Q2em118Q2el1247
homeowner12345
12-19-2008, 12:44 PM
Willing to use stainless steel? Some guy on eBay has three of them at a BuyItNow price of $10.00. Take a look at http://cgi.ebay.com/3-1-2-ss-Female-3-pieces-unions_W0QQitemZ140210268793QQihZ004QQcategoryZ264 19QQssPageNameZWD1VQQrdZ1QQcmdZViewItemQQ_trksidZp 1638Q2em118Q2el1247


Whoops! Never mind - he has three 1/2" unions, not 3-1/2". :o
beenthere
12-19-2008, 12:53 PM
Are you sure its a 3 ½" unioin.

Are you measuring OD, or ID.
HVAC gopher
12-19-2008, 04:50 PM
I asked the service tech and he said It definitely is 3 1/2".

Anyone know where I might get used parts?
acmech13
12-19-2008, 05:06 PM
why do u need this? and why isn't your hvac guy fixing your problem?
beenthere
12-19-2008, 05:14 PM
I don't.
But, it wouldn't be the first time a tech got a size wrong.
I'd remeasure it.
Since the tech didn't tell you weather he was measuring th OD or ID.
hotwaterworld
12-20-2008, 09:30 AM
but why don't you just have a welder come in and weld in a butt joint nipple and be done with it.
Kevin O'Neill
12-20-2008, 01:13 PM
I haven't seen 3-1/2" in 25 years. They used to be used in large industrial oil tank piping. Maybe someone who does oil refinery work could help you. Not sure where to look.

Good luck!
Big
12-21-2008, 01:15 PM
We used a 4 in union with bushings , We added a drip to prevent hammer
HVAC gopher
12-30-2008, 04:14 PM
HotWaterWorld had written: "I know a company in Seattle that probably has one."

Wow! :D That is great!!! :D I would be very interested in getting the name and address of that company.
hotwaterworld
12-30-2008, 09:56 PM
ph # 206-783-6626. This company has been in business for close to a 100 yrs I think and I don't think they have ever thrown anything away. They buy out defunct supply houses, companies etc and throw in their wharehouses here in Seattle. I am alway's amazed at when I ask them for the obscure pipe, valve or fittings that they have it somewhere in the bowels of their bldgs. Good luck, Tim