Potomac Rubber has hydraulic hose and adapters for a wide variety of applications from simple pressure and return lines, to hoses for off the road equipment, and pressure lines for elevators. Most can be fabricated while you wait or as a custom production run. We make custom hose assemblies for quick delivery to industrial, OEM, military and government applications. Need assistance or support? Please call or email our application experts for answers. Request a Quote Spec Sheet PDF THREAD TYPES There are basically two thread systems used in hydraulics. One is the iron pipe thread, the other is the SAE standard screw thread. The type to be used on hydraulic hose couplings is usually predetermined by the pump and valve porting used in the system.