Duff-Norton 5000 Series Rotary Union cartridges have corrosion-resistant, 300 Grade stainless steel construction ideal for water, steam, hot oil & air. They are integrated with two precision bearings to keep the seal faces perfectly aligned for optimal operation & extending operation life. These cartridges feature three seal designs - carbon graphite against a ceramic coated steel seal, carbon graphite seal against a tungsten carbide face ring and tungsten carbide face ring against a siliconised graphite seal ring. Choose from a wide variety of these Rotary Union cartridges, available in mono flow & dual flow configurations on Raptor Supplies.