20 Pack Coupler Connector White UL Approved. This 20-pack of raceway couplers work with the StarTech.com CBMWWD3211 raceway system. Join Two Raceways Together Use these cable raceway couplers with the StarTech.com CBMWWD3211 raceway to join two of them together and extend the length of your raceway in your office or server room. Industrial Strength Made from sturdy self-extinguishing ABS that\'s also warp proof, these wiring duct connectors are UL approved with 94HB Flamability (Horizontal Burning) Rating. Use in Combination with Other Raceway Accessories Combine this coupler with other StarTech.com CBMWWD3211 raceway system accessories to give your cable management solution a finished look. The End Piece (CBMWWD3211E) (20-Pack), cleanly caps off the end of your raceway. The Inside Elbow (CBMWWD3211I) (20-Pack), joins two raceways together inside of corners at 90 degree angle. The Lateral Elbow (CBMWWD3211L) (20-Pack), joins two raceways together and runs them up the wall at a 90 degree angle. The Outside Elbow (CBMWWD3211O) (20-Pack), joins two raceways together around corners at a 90 degree angle. The T Connector (CBMWWD3211T) (20-Pack), joins three raceways together in T-bar. This cable management raceway coupler is TAA compliant and backed by a StarTech.com Lifetime warranty and free 24/5 technical support. StarTech.com has been the IT professionals choice for over 30 years.