Leakproof - Lightweight, corosion and abrasion resistant - features a high-density polyethylene (HDPE) tubing with an aluminum core to maintain any hand-bent shape for easy wall installation. TECHNICAL INFO: - Operating Pressure: 175psi at 70ºF 140psi at 140ºF - Temperature range: -40ºF to 140ºF - Meets OSHA guidelines - Compatible with common compressor oils - Can be buried underground