1977 - Volume #1, Issue #5, Page #32
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Automatic Valve For Stock Tanks
One of the "best buy" new products we've seen lately is a low cost valve that automatically maintains a constant water level in stock tanks ranging from 1 to 5,000 or more gallons in size.
The price is right - only $6.95 - and its operation is so simple you've got to see it to believe it. Here's how it works:
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1977 - Volume #1, Issue #5