• UL Listed
  • Rugged Non-Metallic PVC
  • Interior integral reinforced member within conduit wall
  • Integral Type B construction per NEC® 356.2(2)
  • Rigid PVC spiral core for strength
  • Outdoor applications including direct burial
  • Rated for concrete embedment
  • Sunlight and oil resistant
  • Non-conductive raceway

Temperature Rating

  • 80°C Dry
  • 60°C Wet
  • 70°C Oil resistant
  • 20°C After installation


  • For 600 volt and lower potential circuits
  • 3/8″ through 2″ rated for direct burial and poured concrete
  • Hazardous locations per NEC® 501
  • Industrial and commercial applications
  • Indoor or outdoor locations
  • Suitable for pool and spa use
  • Air conditioning and HVAC units

References & Ratings

  • UL 1660, UL File E123464
  • NEC® 356, 390.15, 501.10(B)(2), 502.10(A)(2), 503.10(A)(2), 511.7(A)(1), 620.21, 645.5(D)(2), 680.21, 680.23, 680.25, 680.27, 680.42, 695.6(E), and 695.14(E)


This specification covers Kaf-Tech UL LIQUID-TUFFTM Integral Liquidtight Flexible Non-Metallic Conduit, Type LFNC-B designed for use in wet, dry or oily locations as a flame resistant, Non-Metallic raceway for power, control and communications cables in compliance with Article 356 of the National Electrical Code. The product is UL Listed for 80°C (176°F) in a dry location, 60°C (140°F) in a wet location and 70°C (158°F) in an oily location. It is also UL Listed through 2-inch trade sizes for direct burial, outdoor use and sunlight resistance. In addition the product is CSA certified for use at 75°C (167°F) in dry and oily locations and for minus 18°C (0°F) low temperature applications. This Liquidtight Flexible harmonized Non-Metallic Conduit is manufactured and tested in accordance with Underwriters Laboratories Inc. Standard UL 1660. The product carries the UL Listing Mark.


Liquidtight Flexible Non-Metallic Conduit, Type LFNC-B is a raceway of circular cross section with a smooth polyvinyl chloride (PVC) inner surface and an integral reinforcing member within the conduit wall. The wall thicknesses and dimensions of the integral conduit shall comply with table 3 of harmonized UL 1660 which is summarized in Table 1.


A separate Grounding conductor is required by the National Electrical Code for all trade sizes.


The outer surface of the conduit shall be clearly marked with a legible print legend in accordance with UL 1660.

Performance Tests

The completed UL LIQUID-TUFF Liquidtight Flexible Non-Metallic Conduit, Type LFNC-B shall meet all of the performance requirements contained in UL 1660 outlined in Appendix A.

Reference Standards

UL 1660
Standard for Liquidtight Flexible Non-Metallic Conduit
File References
UL File E123464
NEC Articles
356, 390.15, 501.10(B)(2), 502.10(A)(2), 503.10(A)(2), 511.7(A)(1), 620.21, 645.5(D)(2), 680.21, 680.23, 680.25, 680.27, 680.42, 695.6(E) and 695.14(E)
Product CodeTrade Size (inches)Trade Size (mm)Length Coil (feet)Length Reel (feet)Approx. Weight/1000 Feet (lbs.)Internal Diameter (min/max) inchesExternal Diameter (min/max) inchesBend Radius inches
6005-24-001 1/43550'-351.380/1.4101.630/1.6608
6006-24-001 1/24150'-481.575/1.6001.865/1.9009