Cincinnati Test Systems (CTS) has over 30 years of sealing experience in leak testing and filling applications. We offer a full line of standard pneumatic connectors, pneumatic tube fittings, Luer connectors, pneumatic tube fittings, and more. To fit your irregularly shaped seal surfaces, we can custom-manufacture specialty pneumatic seals. CTS excels at providing customized designs for the most unique pneumatic applications.

Request a quote on pneumatic connectors or custom pneumatic seals for your application. Contact us to discuss your custom requirements or to learn more about our high-performance CTS Connect products.


Cincinnati Test Systems is an industry leader in standard and custom pneumatic connectors and pneumatic tube fittings. The CTS Connect family of connectors and seals are engineered for ease of use, longevity, and sealing reliability, and are designed to meet all our customers’ sealing needs, from smooth bores to threaded applications.

We produce pneumatic connectors and pneumatic couplings that meet standard, metric, SAE, and other sealing requirements. Our custom pneumatic seals are designed and manufactured to meet your unique specifications. We also offer a line of molded and cut specialty seals for complex sealing applications.

CTS Connect pneumatic connectors and pneumatic tube fittings all use our proprietary seal materials. These unique materials are manufactured to resist wear and are resistant to all types of fluids and chemicals.

Contact us for the pneumatic connectors and pneumatic seals your application requires

See the following product listings to learn more:





  • Powertrain testing
  • OD/ID engine connection
  • Transmission and drive line
  • Fuel, brake fluid, and coolant lines


  • Residential and commercial HVAC
  • Vending refrigeration


  • Gas cylinder testing
  • Transformer testing
  • Pneumatic power tool testing
  • Valve and tube testing

Consumer Appliances

  • Refrigerator testing
  • Gas range/stove testing
  • Water heater testing
  • Washer/dryer testing
  • Faucet/spa tub testing