Capping gas dryer valve

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  #1  
Old 05-16-19, 04:40 PM
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Capping gas dryer valve

So I want to cap this valve for safety as it was bumped into once already and turned on slightly. I can't tell if the top of the valve comes off or not from looking at it. Is there a piece that unscrews and I need a brass plug with pipe dope to plug it, or can I just get a brass flare cap and screw it on the top (without tape/pipe dope)?

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Old 05-16-19, 04:53 PM
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Welcome to the forums.

You could put a brass flare cap right on there with no tape OR you could remove the flare adapter and put on a female brass pipe cap or an iron pipe cap with tape or plumbers compound.
Brass pipe cap
Iron pipe cap
Brass flare cap
 
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Old 05-16-19, 06:13 PM
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Thank you, will try the flare cap.
 
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Old 05-16-19, 08:33 PM
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I couldn't find the cap in store so I've been looking online. Do you by chance know off hand which of these is more likely to fit?

5/8" Thread: 7/18-14
https://www.amazon.com/LASCO-17-4057.../dp/B008E5CZEC

5/8" O.D. Thread 15/16-16
https://www.amazon.com/BrassCraft-M4.../dp/B00B00PYLY
 
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Old 05-17-19, 04:00 AM
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If you think the valve is damaged remove it and cap the pipe.



 
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Old 05-17-19, 08:52 AM
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It's not damaged, does it matter what size thread for the cap? Those two options seem pretty close in size I assume they will both screw on but I dont know which is the correct fit.

Do I just buy both and see what fits better?
 
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Old 05-17-19, 10:02 AM
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Yes it matters. Only the proper size will fit. One is 15/16-16 thread the other is 7/18-14 thread.
If you never intend to use the gas line in the future, remove the valve. Or buy both and see which one fits. What stores did you try? Go to a plumbing supply house. But I would think any hardware store or Lowes, HD would have it.
 
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Old 05-17-19, 11:09 AM
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How did you arrive at 5/8" ?
It should be 1/2" or 3/8".
It looks like you have 1/2" iron gas line there with a 1/2" shut off valve.
Just unscrew the adapter and put on an iron cap.
 
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Old 05-17-19, 12:04 PM
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I might suggest after you get it capped that you remove the valve handle, it can be attached to the pipe with some heavy wire so you will be able to find it if you ever want to use the valve again.
 
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Old 05-17-19, 12:06 PM
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I want to keep the valve for now just in case, will be replacing washer/dryer soon.

I tried Lowes, HD and a local plumbing supply. None of them carry in store aside from one at HD that was lead free brass stated for use with vacuum, water, air lines but I assume would work for this. It doesn't mention thread size at all so I wasn't sure how important it is. Here

Not sure if 7/18-14 is a typo, others seem to be 7/8-14 which would be much closer to the 15/16-16 size.

I guess I'll order both and maybe find another 7/8-14 too. A lot of sites don't mention thread size though.
 
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Old 05-17-19, 12:11 PM
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Good idea, unscrewing that definitely won't cause any leaks?
 
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Old 05-17-19, 02:18 PM
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Old 05-17-19, 06:27 PM
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Thanks, that's the one I linked to above that says it's for air/vacuum lines, but should work right? I think I need the 5/8", it doesn't mention the thread size
 
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Old 05-17-19, 07:56 PM
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I measured the width of the threads OD on the flare adapter, looked about 5/8".
I already ordered those caps but if they don't fit I'll just get a 1/2" iron cap. Thanks
 

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Old 05-22-19, 04:07 PM
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You were right it just needed the 3/8" brass flare cap, and they did have it at lowes it's just not on their website.

It was capped fine but then I did what Ron53 suggested above to take off the valve handle. It started leaking like crazy when I unscrewed it and wouldn't screw back in fully. It wasn't a ball valve just circular and the screw was the only thing that kept it from sliding out of the back.

So I turned the gas off at the main and removed the valve to put a 1/2" iron cap. I left the elbow on because I didn't want to chance turning the pipe and loosening any threads behind the wall.

Is "black iron" okay? I wasn"t sure whether to get black iron or galvanized or if it matters either way?

Thanks
 
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Old 05-22-19, 04:11 PM
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Good job. For gas..... black iron is perfect.
 
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Old 05-22-19, 07:13 PM
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IMO a gas line should never be valved and unattached to a appliance, even if it's capped after the valve. I always remove the valve and cap it.
 
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