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Heyco Heyco-Flex™ III Liquid Tight Fittings

Heyco Heyco-Flex™ III Liquid Tight Fittings are designed for flexible, non-metallic liquid-tight tubing. These Heyco liquid-tight fittings can be used with Heyco-Flex III Corrugated Tubing ranging from 3/8" to 1". This lightweight series is non-toxic and UV-resistant and allows quick and easy installation. Heyco-Flex III fittings are rated for NEMA 4 and 4X (when used with Heyco-Flex III tubing) and NEMA Type 3R applications. The series is ideal for high-vibration or flexing designs and wet and dry applications.

Features

  • For use with Heyco-Flex III Corrugated Tubing in 3/8" to 1" trade sizes
  • Non-toxic and UV-resistant
  • Rated for NEMA 4 and 4X applications when used with Heyco-Flex III Tubing
  • Rated for NEMA Type 3R applications
  • Easy, permanent assembly between the tubing and fittings - push the tubing over the fitting ferrule until the tubing clicks into place
  • Lightweight and cost-effective installation
  • Quick and easy installation
  • Suitable for use in high-vibration or flexing applications
  • Resists salt water, weak acids, gasoline, alcohol, oil, grease, and common solvents - this feature is not assessed by UL certification or testing
  • For use in wet and dry applications
  • If using a tapped hole, Teflon® tape is needed on the threads of the connector - for all other applications, an O-ring and Locknut are needed to attain liquid-tight
  • Use of an O-ring may be required for a complete liquid-tight system with a non-threaded mounting hole
  • Locknuts included with Straight-Thru fittings

Applications

  • Automotive equipment
  • Fiber optics
  • Computers and peripherals
  • Lab equipment
  • Robotics
  • NEMA 4 and 4X (when used with Heyco-Flex III tubing)
  • NEMA Type 3R
  • Heating, ventilation, and air-conditioning (HVAC)
  • Refrigeration

Specifications

  • Nylon 6/6 material
  • UL 94V-2 flammability rating
  • -30°C to +105°C temperature rating
  • IP64 protection rating
  • Certified to Canadian and U.S. Requirements File E121095

Dimensions

Mechanical Drawing - Heyco Heyco-Flex™ III Liquid Tight Fittings

Additional Resources

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Published: 2026-04-09 | Updated: 2026-05-13