MANUFACTURER: Gammon Technical
Gammon Glass Extension Tube – GTP-8600
Some customers prefer to read the hydrometer scale through glass rather than to estimate the reading at the top of the plastic center tube of the model GTP-1073.
For these customers, we provide a short glass tube that fits inside of the center tube and can be stored there.
To take a reading with fuel level in the glass above the plastic center tube, simply pull upward.