The shaft of the Go Direct® Ethanol Vapor (GDX-ETOH) is slightly smaller than the Ethanol Sensor (ETH-BTA). This means that the stopper #6 Stopper for Ethanol Sensor (ETH-STOP) will not hold the Go Direct Ethanol Vapor in place.
To fix this problem, simply trim the stopper with a razor blade and make the split in the stopper a little wider. Start by taking cutting less than 1 mm off the stopper. This should fix the problem.
Please note that we always recommend using a utility clamp or a Electrode Support (ESUP) to secure any of our ethanol sensors during use. The stopper is designed to act as a seal, and should not be used to secure any sensor above a solution.