Maintaining pneumatic tank gauge

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mark01

mark01

Contributor
Scuba Instructor
Messages
254
Reaction score
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Location
Des Moines, Iowa
# of dives
500 - 999
I recently acquired a pneumatic tank gauge which sports a glycerin filled gauge. There exists a small plug at the top of the gauge housing which I assume could be removed so that fluid could be added should the gauge require additional glycerin. Am I correct in my assumption about that plug and where would I find glycerin??

TIA

Mark
 
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