Glen Goodrich sized all of my lines (wet-dry) and even did the install with my father and me in 2002 on my fathers woods. It is one of the woods I still tap. Glen bought the sap from my father until 2008. I have been around Glen all my life, he has been my neighbor and still is. He started sugaring with my fathers buckets in the late 70's or early 80's when he lived on Cow hill. My vac is 26-27 inches at the end of every mainline.