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(ET) Hydrometer caps

Subject: (ET) Hydrometer caps
From: Bill <wilbett earthlink net>
Date: Wed, 18 Jun 2003 22:57:39 -0500
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Hello List:
    I am wondering if there is such a thing available as screw-in
hydrometer caps having  the green eye indicator. I've never seen one.
Also, what's the secret on those batteries never needing water added?
Are they sealed airtight? Can our regular 6 volt batteries be sealed so
they would never need water added?
    If somebody has knowledge on this kind of stuff, I'd like to get
educated. Thanks in advance.

Bill/E-12/NE-KS

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