Here is a picture of a through-bore slip ring.
High IP Level Waterproof Slip Ring Integrate RS422 Signal For Offshore Oil Rigs
Here is a picture of a through-bore slip ring with waterproof function.
CENO's water-proof slip ring is designed for ships, harbor equipment,test equipment and some application which has water or moisture environment,to transmit precision signal, weak current, large current, high voltage. Meanwhile its design prevents the liquid seeping into the slip ring with the characteristics of low torque on rotation and low loss on signal transmission,as well as no need to do maintenance, low electrical noise, long lifespan and so on.
Features
Center hole is easy to install,as well as integrate hydraulic,pneumatic,fiber optical,RF rotary joint
Low friction, long life,Low torque, smooth rotation
May work under water 100m,anti-corrosion
Applications
For marine
For offshore oil rigs
Seaport machine