TAZ PRO Left Idler Tube Clamp printed in LulzBot Green, PP-GP0427.
TAZ PRO Right Idler Tube Clamp printed in Black, PP-GP0428.
These tube clamps work with the E3D Style toolheads. This clamps on to the Idler Lever and allows the lulzbot filament guide tube to attach to the toolhead which keeps it from kinking while traveling.
These come on a Lulzbot TAZ PRO for the Dual extruder where Green is #1 extruder and Black is #2 extruder.