3/16 at end of 5/16 line for vac.

[Worcester]

Hi I saw on here last year a few folks were going to try putting 3/16 at the end of their 5/16 gravity lines.
I have about fifty 5/16 taps up and will be doing some 3/16 this year.
Will it create vaccuum if I put 3/16 tubing on the 5/16 line after the last tap and have 3/16 run to the collection tank?
Who on here tried this last season?
Thanks!

[Loch Muller]

Never tried it but it seems like it might work if you had enough drop after you switch to 3/16 th. Although I'm not sure I completely understand how this works, the weight of the column of sap in the 3/16 th should create the vacuum. Not sure what happens when you transfer that vacuum to a larger(5/16 th) line though. Maybe put a vacuum gauge on the line and compare it to your completely 3/16 th setup. 50 taps may be too many for one 3/16th line. Good luck.

[andyp]

Hi I had 2 lines last year one with 28 taps and 3/16 line all the way.
Also had one with 24 taps 5/16 line to the last tap than 3/16 the rest of the way.
I couldn't see any difference between the two they both ran beautifully

Andyp