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Old 01-09-2011, 08:10 PM   #1
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Flare nut for gas connection- question

Help! I have an old gas space heater that is in minty condition (not as dangerous, but still not code) that I want to hook up in a garage area for occasional and closely supervised use. It has a flare male inlet that is smaller than the 1/2" OD but larger than the 3/8" OD end fittings that come on the standard yellow flex gas connector lines. It seems to fall in between these sizes but I don't see other sizes listed anywhere! Does this mean I need to be looking at something different like a separate flare nut that's 37 vs 45 degrees or something(these diff TPI's?)? I'm not sure if the OD sizing of the fittings on my yellow flex line are the same sizing as standard flare nuts. If not, I can flare a short run of copper to mate it up. FYI, when I "getto caliper" my 3/8 flare threads it measures actual 9/16" and my heater threads measures about 5/8" but threads are slightly smoothed so I may be shy 1/16 by that plus getto error. Any insight or tutoring on flares would be greatly appreciated. When they say 3/8 OD do they mean copper tubing diameter or thread OD? I'm assuming the copper tubing diam. Lil confused on this too. dave


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Old 01-09-2011, 08:25 PM   #2
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You need to visit your local Plumber or Gas company to see what they can help you with. I strongly reccomend you do nothing without their advice or wisdom. A computer screen is very a very hard way to advise on gas. If this heater is not to code you dont even want it in your Garage! Not to mention the fact that you will have to elevate it to meet code for combustible gasses.


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Old 01-09-2011, 08:44 PM   #3
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It won't ever meet code here. It's one of the small 12 inch by 12 inch mini heaters. They don't technically allow those because kids get burned and the open flames are way too hazardous I guess but this one is the first tiny one I've seen that the flames are more enclosed and won't leap out the front. Many many people still use them sparingly on very cold days around here. I have one in a fire place that's been here since 1939 that gets lit maybe twice a year for couple hours. There's antique stove/range restoration shop here that also refurbs these tiny heaters so I'll just get to his place. I thought the post might scare everyone. Just wanted to find out about flare nuts.
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Old 01-09-2011, 08:48 PM   #4
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Change the tubing for a standard pipe fitting if you can.
When its all said and done there is usually more said than done
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