Need some suggestions on what tubing to use for my small sugarbush. Last year I had 14 taps on 3/16" line all merging to a ditchline collection point (7 along a 200' long x 30' drop, 4 from a 40' long x 12' drop and 4 from a 30' long x 8' drop). This worked out pretty good last year, but had to pump sap up a 200 ft hill to get it out of the woods. This year, I want to extend this ditch line collection point to a road about 300 ft away on about a 3 degree downward slope (300' x 15' elevation drop). I am also wanting to tap another 15 trees along the way.

Any recommendations on what tubing to use for the extension: continue with all 3/16" tubing? switch to 5/16" for the 300 ft mainline extension, with 3/16" for the 15 new trees along the 300 ft extension? Any other way? I don't have electric for vacuum so need to rely on elevation drop. Any suggestions would be much appreciated. Thanks in advance. Gwebb