Fluid Rotary Union Model 70

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The Model 70 is a multi-pass fluid rotary union that has served as the standard FRU to the diving industry for over 30 years. It is available as a stand alone FRU or can be combined with electric slip ring and fiber optic rotary unions. Typically configured with up to 13 passes, inter-port mixing is prevented through the use of double seals and an intermediate vent between passes. It has also proven itself in non diving applications such as centrifuge, indexing tables, and floating oil production swivels where product quality is paramount.

The Model 70 is available in several standard port configurations as illustrated below. The Model 70 is available with two standard application specific seal options. In its standard configuration, it is rated for 1000 psi [68 bar] at 10 rpm continuous service and up to 30 rpm intermittent service.


  • Configurable with up to 13 ports as standard
  • 1/4, 1/2, 5/8 and 1 inch SAE straight thread o-ring ports standard
  • Corrosion resistant materials suitable for hot sea water and other harsh chemicals
  • Rated to 1000 psi [68 bar] at 10 rpm continuous service
  • Maximum speed 30 rpm intermittent
  • Polymer bearings eliminate the need for periodic service
  • Optional rolling element bearing design available
  • Available with hollow bore for ESR / FORJ pigtails


  • Continuous 360º rotation
  • Proven reliability
  • Provides long maintenance free service
  • Configurable


  • Marine: diving umbilical winches, seismic survey winches, hydraulic control winches
  • Scientific: centrifuges
  • Military: radar turrets
  • Industrial: machining centers, rotary index tables, heavy equipment turrets, cable reels, packaging machines, palletizing machines, labeling machines, remote sensing

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