The maple industry is seeing rapidly-growing excitement for 3/16″ tubing and it’s ability to create a natural vacuum. Below are some articles that talk more in depth about the differences in using natural vacuum vs the traditional artificial vacuum.
“The 3/16 Phenomena”, Online Article From The Maple News
“Strategies for Maintaining High Sap Yields with 3/16 Tubing”, Online Article From The Maple News
“Tubing System Installation”, Online Article from Penn State Extension