Tank checker help

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gopbroek

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Location
Lewisville TX
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A friend sent me a picture of a tank test gauge for a yoke fitting that has a pressure operated coupler. Below is a picture, as described to me it self seals to the tank once pressure is applied. I suspect part of the input pressure is bled to a piston operated coupler. On the side there is a spring loaded purge button. The gauge is manufactured by Instrutek (Mexico gauge manufacture) but I do not know who makes the coupling device. Does anyone have any info on this?
upload_2018-3-14_14-3-38.png
upload_2018-3-14_14-4-15.png
 
I really dislike both the tester and the fill whip, darn things will bite you hard if you are not careful.
 
https://www.shearwater.com/products/swift/

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