Teflon® Tubing for RAE Systems Gas Monitors / Detectors. Teflon® Tubing for pump-equipped multi-sensor and PID RAE Systems instruments. Size: 1/8" I.D. 1/4" O.D. and 1/16" wall Make: Teflon® Lengths Available: 10', 15', 30' and 50 Foot Lengths.