I have three sight tubes for sale with stainless protective steel covers. They were purchased from MoreBeer. I have two 16" sight tubes and one 20" sight tube. The 16" sight tubes are $17 + shipping and the 20" is $20 + shipping. Each sight tube has a 1/2" NPT stainless steel adapter.
Reason for sale: I am a Brewtroller user and can read the volume of each vessel with the Brewtroller and a Bubbler System using freescale pressure sensors.
***** Both 16" Sight Tubes are Sold
The 20" sight tube is still available