Should Lateral Lines Be Vented?

A great deal has changed since the 1960s and 1970s in terms of maple production and recommended practices, especially given the introduction of the new polyethylene tubing formulations and new types of spouts. Consequently, we are occasionally asked whether lateral lines in gravity tubing installations should be vented. As a result of these questions, we compared sap yield from standard non vented (closed) 5/16″ lateral lines alongside a vented 5/16″ installation under gravity conditions.

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