Two rotary unions fitted in tandem, capable of handling two different fluids, as the inter-pass leakages do not mix in the event of seal failure. These are suitable for Pneumatic, Vacuum and Hydraulic application.

They can be put to use in high-pressure hydraulic service at low rotational speeds. Sealing is achieved with a pair of O-rings and back-up rings located in place by a compression spring. Available with nickel plated carbon steel rotor and aluminum housing.