Rex's breadth of line is an important benefit to rotary union users. Since Rex rotary unions are available in many configurations, con- struction and options, we can provide customers with he exact rotary union each application requires. The performance of a specific type and size of rotary union varies with changes in operating speed, pressure, media, temperatures, and union support characteristics. No one single union configuration or style, no matter how sound its basic design. can perform equally well under eveiy set of application conditions. By the same token, a specific union style should be available in a variety of sizes, configurations and construction materials to assure proper com- patibility with different flow media and operating requirements.