Keep an eye on the flow during transfer or monitor yeast activity during fermentation with this 1.5" tri-clamp sight glass. Place the sight glass in-line when you transfer wort from kettle to fermenter to help you oversee how your in-line oxygenator is flowing. One of the few disadvantages of a stainless steel conical is that you can't watch the yeast as they go to work. With a sight glass you'll be able to observe how your yeast are performing throughout the fermentation process. This also makes for a great way to harvest yeast. Simply attach it to your dump valve and close off the other end with a T.C. end cap, collect the yeast and remove the sight glass, cap it at the other end and store it for your next batch.