• Polyethylene Tubing, black, 1/2” OD x 3/8” ID, FPE rated — durable tubing designed for use in aspirating smoke detection systems. The black polyethylene construction is flame and smoke rated (FPE) for enhanced fire protection performance. Its 1/2” outer diameter and 3/8” inner diameter allow efficient airflow for accurate smoke sampling across a wide range of environments, including commercial and industrial installations.