Prepare your semi to be Ready for the Road Ahead , with the Gates 3.1" JIC 37° / SAE 45 Flare Swivel Steel Hydraulic Coupling that offers a smooth transfer of power between hydraulic components. To quickly connect fuel lines, pumps, and hoses, this replacement coupling is forged with a streamlined design that is fast and easy to pair. Fashioned with a durable metal body to withstand demanding conditions and extreme pressures. FleetPride is your First Click in Heavy Duty .