Yetter 2940-010 Combo - Manual (Page 9)

9
AIR LINE INSTALLATION
Route up pressure (blue) lines from elbow fittings toward the face
plate of the row unit. Zip tie air lines to the holes provided (as shown
in picture) keeping air lines away from pinch points, rotating parts, or
anything that may cause wear or damage to lines. Up pressure line
will loop around (as shown in picture) and connect to a tee. Safely
route blue air line from the top PTC port of the Tee into the main up
pressure trunk lines.
Route down pressure (black) line from the elbow fitting alongside the
up pressure(blue line) to the main down pressure trunk lines.