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Old 11-10-2013, 02:07 PM   #1
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Question Where to find a propane tank leak proof brass cap

Greetings,

Our --my son's-- camper is parked in his driveway. Since there have been recurring thefts in his neighborhood, when not camping and during during the winter month, he disconnects his two 5 gallon propane tanks and stores them in his garage.

We have been looking high and low for
(1) 5 gallon propane tank brass/metal cap that screws on to the tank valve to keep the tank from leaking, or
(2) a simple screw on cut off/shut off valve.

Does anybody know where either of the above items can be found?

Does anybody use any of the above items?

Thanks!

Pat
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Old 11-10-2013, 02:38 PM   #2
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The tanks should not leak with the valve shut off.
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Old 11-10-2013, 03:33 PM   #3
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x2

If the tank is leaking I would take it to a registered LP dealer to have the tank emptied and disposed of. Don't forget to store your tanks in a non-enclosed area.
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Old 11-10-2013, 05:31 PM   #4
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X3. If your tank leaks ANYWHERE with the valve fully closed, it is a dangerous tank. Period. If the valve is leaking, it can be replaced with a new one. If the leak is anywhere else, the tank is junk. Trying to trap the leaking gas in a cap is asking for trouble.
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Old 11-10-2013, 05:35 PM   #5
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Agree with the last 2 posts. If the valve leaks, it is no good.
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Old 11-10-2013, 08:39 PM   #6
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Quote:
Originally Posted by patrickscott View Post
... he disconnects his two 5 gallon propane tanks and stores them in his garage.

...
Thanks!

Pat
I presume that you are concerned that the tank valves may leak so you want to have a secondary cover for safety?

I did a search and couldn't find a metal cover/seal either. That doesn't mean that they don't exist, but I suspect that they may not based upon the valve design.

This is why I think that.

Your (newer style) tank already has a secondary safety check valve built in.

The standard travel trailer propane tank uses an Acme Low Pressure Fitting. That fitting inserts into the inside of the valve body at which time the tip presses against the safety check seal to open it and allow flow. You may have noticed at one time or other that if the plastic Acme knob isn't tight enough that you get no gas pressure. In that situation the nub hasn't been pressed in far enough to release that safety valve.

As to an external cap, the valve connection style is not really designed to seal to any external parts. (The plastic storage covers are to keep the valve clean.)

Being that the newer style Acme propane tank valve has that built in spring loaded safety check valve it makes any external cap seal sort of unnecessary. There is also a built in tank pressure relief to vent the tank if the pressure becomes too high.

There is likely better description out in the World Wide Web than I gave here.

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Old 11-11-2013, 10:33 AM   #7
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Thanks to all that have replied for your very detailed replies.

How can one tell if one has one of the newer tanks with the Acme Low Pressure Fitting? The tanks on the trailer look fairly old...

Thanks!
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Old 11-11-2013, 10:44 AM   #8
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I presume this is an example of an Acme Low Pressure Fitting

Click image for larger version

Name:	acme.jpg
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Old 11-11-2013, 11:05 AM   #9
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Quote:
Originally Posted by patrickscott View Post
I presume this is an example of an Acme Low Pressure Fitting

Attachment 10576
That's it. Acme refers to the thread style on the black nut/twist handle, not really the entire regulator and connector assembly you show in the picture.

I would believe that there are few of the older style valve with left hand connector tanks still around because for many years now regulations require that those valves be replaced. It is illegal to refill the tanks with the older style valve. The "Acme" style tank valves will still accept the older style left hand thread connector though.

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Old 11-11-2013, 09:25 PM   #10
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The new valves do not have a round wheel to open and close. The new valves have a three sided wheel to open and close. As mentioned the new style will accept an outside connector or a left handed inside connector.
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