Where to find a 1-3/4" Cast Iron radiator bushing?

JerseyDIYguy

I got myself in a bit of a jam...

I stripped the threads on a union fitting (spud?) of a 90 year old radiator. I managed to get the spud out but doing that also damaged the reducing bushing that connects to the radiator body. The threads on the bushing that go into the radiator are 1-3/4" NPT male black iron. I got the bushing out of the radiator and it's unusable.

I've scoured the internet and haven't found anything anywhere in a 1-3/4" threaded bushing, fitting, nipple, etc. so I'm assuming this is a size from the good old days that's no longer used.

Anyone have any suggestions on where to find a 1-3/4" bushing? I'm fine with it reducing to anything from 3/4" up to 1-1/2".

Steamhead

If you're going by the outside diameter of that bushing, you'll get the wrong dimension. What you have is 1-1/2", which is the inside diameter of that size pipe.

KC_Jones

Compare what you have to this chart, I agree with Steamhead most likely 1 1/2" pipe size.
http://www.harvel.com/piping-systems/harvel-pvc-pipe/schedule-40-80/dimensions

JUGHNE

Just so no one can say that 1 3/4" is never used anywhere. There is 1 3/4" fire hose, but every 50' you have a 1 1/2" hose coupling set. The 1 3/4" size is used because of friction loss on 150 to 200' line set. All the fittings associated with this are 1 1/2".

Just some trivia to point out that 1 3/4" is not a standard size for plumbing/piping.
And also to add to the confusion.

JerseyDIYguy

Well color my face red!

I was comparing the old bushing to what I thought was a piece of 1-1/2" NPT Pipe. It turns out the pipe was 1-1/4". Problem solved!. How do you spell D'OH! again...