Silicone Bending Inserts
For use with hard tube the silicone bending insert prevents the rigid tubing from collapsing when a bend is made. The bending cord is also heat resistant.
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Mayhems - Tubing Tools - 12.7 mm Silicone Bending Rubber for 13 mm ID Tube | 1 Meter (MSRC131M)
Mayhems 1.01 Meter Silicone Bending Cord 12.7mm OD for 13mm PET-G and Acrylic hard tube BendingLearn More$9.95