Heyco Conduit, Tubing & Fittings Heyco-Flex™ III - Liquid Tight Tubing
Flex III

Material: Halogen Free Nylon 6


Certified to both Canadian and US Requirements File E121095

Flammability Rating: 94V-0

Temperature Rating: -18°C to 105°C (0°F to 221°F)

  • Corrugated tubing for trade sizes 3/8" through 1".
  • Flame retardant, won’t burn.
  • Nontoxic and UV resistant.
  • Rated for NEMA 4 and 4X applications when used with Heyco-Flex™ III Liquid Tight Fittings.
  • Rated for NEMA Type 3R applications.
  • Maximum flexibility can be used in extremely tight quarters. Bend radius of Heyco-Flex III is equal to its outside diameter.
  • No threading of the tubing required to install. This eliminates the possibility of cutting the tubing and creating leak paths.
  • Easy, permanent assembly between the tubing and fittings: push the tubing over the fitting ferrule until the tubing "clicks" into place.
  • Lightweight and lower installed cost.
  • Quick and easy installation.
  • Resists corrosion, oil, and water.
  • For use in both wet and dry applications.
  • Suitable for use in high vibration or flexing applications (automotive equipment, fiber optics, computer and peripherals, lab equipment, robotics, etc.).
  • Voltage Rating: 300V.
  • Mounting brackets are available.
  • Use cutting tool Part No. 8340 for cutting Heyco-Flex™ tubing cleanly and evenly.
Heyco-Flex III Liquid Tight Tubing
Flexible, Nonmetallic Liquid Tight Electrical Tubing
Trade Size Part
Description Part Dimensions Coil
Outside Diameter
Inside Diameter
Black in. mm. in. mm. feet
3/8 8478 HF3 3/8 FR   .710 18,0 .514 13,1 100
1/2 8479 HF3 1/2 FR   .850 21,6 .651 16,5 100
3/4 8480 HF3 3/4 FR 1.116 28,3 .865 22,0 100
1 8481 HF3 1 FR 1.350 34,3 1.103   28,0 100

Part #8340, VF-28 Cutting Tool

Cutting Tool

  • A versatile and economical tool that easily cuts polyethylene, rubber hose, and tubing up to 1.5" (38,1 mm).
  • Also ideal for PVC pipe and other non-metallic materials up to 1-1/4" (31,8 mm).
  • Clean cut every time.
  • Tough nylon handles.
  • Durable and dependable.