3.75" long,tapered bolt,gripping wings???...see both pictures

It might be an internal pipe wrench.

That's it, John!
https://wildetool.com/catid-62.cfm

HUH... learned a new one there.

Thanks

Skip

thanks,heres another not as .....well more crude

Quote from: international3414 on February 27, 2014, 08:40:51 PM
thanks,heres another not as .....well more crude

Those are also called nipple wrenches.  I have seen many of those that were bent/twisted.

Here is another one:

good for removing a broken pipe or nipple from a fitting, but use a penetrant 1st.

That's the style I am familiar with, the original one on this thread is new to me.

Skip

Quote from: wvtools on February 28, 2014, 07:12:22 AM
Here is another one:

Ideal for screwing short barrel nipples into malleable iron pipe fittings, e.g. central heating radiator connections...

Quote from: Billman49 on March 01, 2014, 04:45:59 AM
Ideal for screwing short barrel nipples into malleable iron pipe fittings, e.g. central heating radiator connections...

I didn't know if it was safe to respond to a thread that was referring to twisted nipple whatevers.  I once worked with a nasty girl that would laugh and giggle whenever we used certain words. It wasn't cute, either.  She was scary. We renamed parts - nipples were now "short pipes with threads on the end" we just stopped saying dog robbers altogether. I don't know why she had such a cow about those.

We use a nipple wrench, these aren't a nipple wrench in our vernacular- they are internal pipe wrenches and it is okay to laugh at someone using one. The user would probably be an electrician, anyway.  A true nipple wrench has short (2-3) threads made onto a sort of through coupling, the end of the pipe is up against a stop and wedged in.  When the nipple is made up tight, the stop us released from the nipple end. That loosens everything up and the wrench is backed off the 2-3 threads.

Our smallest steel pipe in fire sprinklers is 1".  If I have to back one out above a ceiling I have an easy out welded to 1" pipe. Just stick it up in the pipe and wrench it out backwards.

Chilly

"we just stopped saying dog robbers altogether. I don't know why she had such a cow about those."

The only time I've heard the "dog robber" term it was used to describe the aide to a general officer in the army.  What is it in the plumbing or fire sprinkler business?

Quote from: mikeswrenches on March 06, 2014, 07:22:19 AM
"we just stopped saying dog robbers altogether. I don't know why she had such a cow about those."

The only time I've heard the "dog robber" term it was used to describe the aide to a general officer in the army.  What is it in the plumbing or fire sprinkler business?

Most sprinklers have 1/2" pipe threads - 3/4" is used also and some special warehouse sprinklers have 1" threads.  A dog robber is a fitting, sometimes malleable iron but nowadays usually brass, that is an extension piece. Male x female threads.  It solves some problems. For instance a pipe is dropped down from a high warehouse system to a bathroom that is to get a sheetrock ceiling at 8'-0" aff (above finish floor). The framer runs into a problem and sets the ceiling at 7'-11-1/2" aff.  The easy fix is to remove the sprinkler and install a 1/2" long dog robber and re-install the sprinkler. Brass ones are made ip to 2" long.  Tne malleable iron dog robbers add 7/8" length and come in 1/2" & 3/4" thread size.

Chilly