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Left handed thread

ttekushan_2 Member Posts: 57
Funny this should come up now. I'm working in a building loaded with the old wall hung radiators. I have to remove some cracked sections, etc. Fortunately the supply shelves in the boiler revealed a box of 4" long 1-1/2" nipples with RH thread on one side and LH on the other. But I am running out. What to do?

Just try to google "right hand left hand nipples." OK. its not so bad, although I braced myself for, um, unusual listings.

Anyway, here's where I found exactly what I was already using:


These may be a bit long for some tastes, but I have found them to be an adequate solution for anything ailing these radiators.



  • Steve_121
    Steve_121 Member Posts: 1
    Left hand thread

    Does anyone know where I might find a 1-1/2" left hand thread black or cast-iron plug. I'm trying to refit an existing old panel type cast-iron radiator for a job.

    Thanks for any suggestions
  • JohnNY
    JohnNY Member Posts: 3,226
    I'll bet...

    ...you won't find one.
    More likely, you'll find a L/R bushing and a plug.

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  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    Left- Hand Thread

    Try Googling it. The best I was able to come up with was a nipple 1 1/2" x 4" with left hand/right hand thread used for those areas that don't allow unions in gas lines. Cost me about $25+ , but I needed it to turn a one-pipe wall-hung rad into a two pipe.

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  • Adam_19
    Adam_19 Member Posts: 1
    left hand thread

    Hi Steve , had a similar problem earlier this year . You can buy a left hand bushing from shafter bros in Montreal , they cost about a 100 canadian .What I ended up doing was taking a left and right hand nipple and cutting off the left hand threads .I welded the left hand thread nipple into the socket weld cap . It ended up costing me about 20 bucks , but if you cant weld it might cost a bit more .
  • Timco
    Timco Member Posts: 3,040
    Just a guy running some pipes.
  • c.t.kay
    c.t.kay Member Posts: 85

    try washington supply,bronx,nyc.
  • Christian Egli_2
    Christian Egli_2 Member Posts: 812
    1 1/2 by 11.5 NPT LEFT HAND

    Here is a left hand plug I have available. Email me if you wish. [email protected]
  • Jerry_15
    Jerry_15 Member Posts: 379

    I know this sounds wierd, but I watched a smart old guy (I was younger then) run a right hand tap right right down the same hole and re-cut the threads in about five minutes (not even, not much material coming out). He was careful to run the tap way down on the taper, the outer threads were pretty clean. Liberal application of tape and dope (I'd probably use blue glue these days), regular plug, case closed, 15 minutes maybe. 1 1/2 taps aren't cheap, but if you do rad work you probably have a selection on the truck already to chase threads on valve replacements; I do. Of course that plug from Christian looks awfully sexy, and easy. I'll be contacting him myself to see if he has any other good stuff. Good luck.
  • Jerry_15
    Jerry_15 Member Posts: 379

    By the way, the two hole fastening probably requires a swinging arm two-pin wrench that the yachties use for deck fittings. Check your local marine supply, or just put some tooth marks on the outside. A lot of marine stuff is reverse thread to keep one from putting fuel into the drinking water
  • Christian Egli_2
    Christian Egli_2 Member Posts: 812
    Sexy plugs, ooh

    A fancy tool is nice, but with two Philips screw drivers, or two dowels, or two whatevers, combined with a pry bar or a third screw driver you can handle the plug quite easily.

    Those holes are 1/4 inch

    This allowed for a unobtrusive flush finish and flat space for adding a possible 3/4 hole. Square or hex heads are doable too.

  • Mitch_6
    Mitch_6 Member Posts: 549
    In massachusets

    you could try PV Sullivan in Quincy, Metropolitan pipe in Boston or Watertown supply in Watertown.

    All specialize in funny stuff.

    Sorry no ph numbers.

    Mitch S.

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  • Jerry_15
    Jerry_15 Member Posts: 379

    Of course: you can always make up a tool for a one-time shot, and I'm sure my idea of re-cutting the threads rh was terrifying to most. That clean plug is a great easy fix, and one that I would use in a heartbeat. Please send me an e-mail Christian, I would like to know what other products you carry.
  • thfurnitureguy_4
    thfurnitureguy_4 Member Posts: 398
    2\" LHT to 1.25 NPT

    Any chance of getting a 2" LHT bushing to a 1.25" NPT RHT???
    Need one for a radiator
  • Adam_20
    Adam_20 Member Posts: 2

    Get a left hand die from RIDGID and cut the threads 2" or 1 1/2" or whatever size you need then cut the threads off and weld them to a socket weld cap .You can tap the cap for whatever size you need .But if you want it right now Shafter Bros in montreal has them but they are expensive 1OO bucks . Sounds expensive but after screwing around it might be the cheapest alternative.
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