Recommended for petroleum and water-base hydraulic fluids in suction lines or in low pressure return lines. Meets or exceeds requirements of SAE 100R4 (except 1 in. I.D.). Meets Flame Resistance Acceptance Designation MSHA 2G. Recommended Couplings: MegaCrimp® Couplings (-12 and -16), Use Clamp over beaded nipple.