Bulk SAE 100 R4 textile reinforced hydraulic hose is mainly used for oil suction and delivery in the hydraulic systems. It is composed of three parts: tube, reinforcement and cover. Specification: (1)Dash:R4-12 (2)I.D. Inch:3/4â?³ mm:19.1 O.D. mm:34.9 (3)PSI:305