Rotary Union Products


Electrical Slip Ring Products


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  • Our rotary union products provide options for both single and multiple passage designs capable of handling different media types simultaneously.

  • From our standard rotary union products to our custom designed solutions, our engineers will help you find a solution that meets your exact specifications.

GP 3 Passage Rotary Union

The GP Series 3 Passage rotary unions are commonly used for applications that require a supply/return line plus an additional line for a separate media. DSTI’s exclusive DynaSeal™ seals allow all GP Series products to be used to safely pass multiple medias.

GP 3 Passage Rotary Union

part # thru bore overall diameter overall length min torque* passage size slip ring option
GP-130---2.6874.147250.156---View Model
GP-1310.5002.9374.186300.156View Model
GP-230---3.1875.290900.250---View Model
GP-2310.7503.7505.6011000.250View Model
GP-330---3.8756.0301000.375---View Model
GP-3310.7504.1876.3421300.375View Model
GP-430---4.2507.0611100.500---View Model
GP-4310.7504.9377.4061200.500View Model
GP-530---5.2508.2804500.750---View Model
GP-630---6.93710.5706001.000---View Model

All dimensions are shown in inches. Click here to convert to Metric

*This is the minimum torque required to rotate based on zero pressure measured in inch-pounds


Standard electrical slip ring options available.

Max. Pressure¹7500 PSI (515 BAR)
Max. Vacuum¹30 HG
Max. Rotational Speed¹up to 850 RPM
Temperature Range¹0° F to 220° F (-18° C to 105° C)²

¹Values are dependent on a combination of all application parameters. Please consult with DSTI.

²Applications with temperatures above 220° F (105° C) require alternative seal materials. Please consult with DSTI.

Connection Sizes1/8", 1/4", 3/8", 1/2", 3/4", 1". Other sizes available upon request.
Connection TypeNPT & BSPP threads standard. SAE, NPTF, and other thread options are available on a custom basis.
Plating and CoatingsBlack oxide plating is standard. Anodized, E-Nickel, Chrome, Nitride, Ceramic and other specialty platings are available as custom options.
MaterialsCarbon steel is the standard material for the GP Series, Stainless Steel is the standard material for the GPS Series. Aluminum, Brass, and other materials are available on a custom basis.
Mounting OptionsThe GP series unions have a unique shaft configuration that consists of individual female tapped passages with an o-ring gland around each for optional flange mounting. There are also tapped holes on the end of the housing for mounting the assembly.
Slip Ring OptionsThe GP Series unions are available with a number of Electrical Slip Ring options for power, signal and data transfer. The assembly is available with an aluminum cover to protect the slip ring during use in demanding environments.
Media TypesCoolant, Gases, Oil, Water (GPS models only)
O-ring Face Seal OptionsO-ring face seal options available for 10 & 12 passage GP Series models. Please add "-OF" to the part number. Example: GP-201-10-OF
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