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Understanding Tubing Fittings

January 9, 2020

This article gives a quick description of each type of fitting and also shows photos of each fitting in action.

[A] Spout

Use this to connect the tree to your tubing. Each spout will have TWO sizes listed in its specs:

    • TAP HOLE SIZE — options are either 5/16” or 1/4“.
    • TUBING SIZE COMPATIBILITY — options are either 5/16” or 3/16

(See part A in the photos below) 

[B] Dropline Tee

This Tee contains three barbed connections. All three connections are hollow. This allows sap to flow from the tree’s dropline into the lateral line. It also allows sap from the upstream trees to pass through the Tee on its way to the collection tank. (See part B in the photos below)

[C] Endline Tee

On the last tree on a lateral line, some folks may choose to use an “Endline Tee” rather than a regular Dropline Tee. Just like the Dropline Tee, the Endline Tee contains three barbed connections. However, only TWO out of the three connections allow sap to flow and the third barb is plugged. This allows sap to flow from the LAST tree’s dropline into the lateral line. (See part C in the photos below)

As of 2022, Smoky Lake has discontinued carrying the Endline Tee. Instead, we recommend using a regular Dropline Tee at each tree. This just keeps things simpler for set up.

[D] Endline Loop or End of Line Slider

These types of fittings are used to terminate the lateral line at the end tree and hold the tubing tight. (See part D in the photos below)

[E] Saddles

(Not yet pictured here.)