Construction: Tube:oil resistant synthetic rubber. Reinforcement:four high tensile steel wire spiral layers (4 w/s). Cover:â abrasion and weather resistant synthetic rubber. Temperature range40c to +121 c. Applications: Ideally suited for high-impulse applications. No skiving required with w-series fittings. Recommended for petroleum and water-bases hydraulic fluids in very high pressure applications. Meets or exceeds all sae 100r12 specifications.