Is there a fitting to extend hydronic radiator piping?

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4lane

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Hi!

I have cast iron radiators fed by (I believe) 3/4" copper piping. Piping was put in before the floor tile was completed. After I completed the tile, the piping is now short about 1" or less. What kind of fitting would be best to close up this spacing? I'm thinking some male/female adapter that I can put between the water inlet and shut off valve but couldn't find anything that size...

Thank you!
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Tuttles Revenge

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That would be a nipple extender, which is a male by female threaded fitting. They come in a variety of lengths.. So get a few different sizes. Black iron or brass would work in a closed loop hydronic system.
 

4lane

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That would be a nipple extender, which is a male by female threaded fitting. They come in a variety of lengths.. So get a few different sizes. Black iron or brass would work in a closed loop hydronic system.
Yes, this is just what I was looking for, but I haven't found anything for 3/4", let alone different sizes. Do you have a specific source online for something like this?
 
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Looks like it may be referred to as a fitting extension.

Another way to fix it may be to cut the copper tube and extend the male adapter. If I were to try this method I would buy a spigot male adapter that solders into a fitting. So I only had to solder the 2 sides of the coupling.
 

John Gayewski

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Menards (not sure about some other stores) carries a coupling that is about 3 inches long and is meant to cut to whatever size you need. I've never tried one yet, but I've thought about it, lol.
Looks like it may be referred to as a fitting extension.

Another way to fix it may be to cut the copper tube and extend the male adapter. If I were to try this method I would buy a spigot male adapter that solders into a fitting. So I only had to solder the 2 sides of the coupling.
 

4lane

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I did find some general brass 3/4" NPT female 3/4" NPT male adapters but they only have a working pressure of 150 psi. Will that work?

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Menards (not sure about some other stores) carries a coupling that is about 3 inches long and is meant to cut to whatever size you need. I've never tried one yet, but I've thought about it, lol.
We used the long couplings on a project that had dozens of freeze leaks. I think the couplings we bought were 12" long.
 

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Contact a place like Supplyhouse dot com or Ferguson dot com and just ask them if they stock varying lengths. We buy them from their fire sprinkler division of ferguson.
 
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