Liquid Tight Non Metallic Flexible Conduit

Source

Material Identified

Notes

Southwire

PVC

Rigid PVC reinforcement in flexible PVC wall, oil and crush-resistant

Flexiblepvc.net

PVC

Lightweight, flexible, suitable for water-tight connections

Kraloy Fittings

PVC

Integral rigid & flexible PVC, UL listed for various conditions

Sealproof (Amazon)

PVC

High quality virgin PVC, UL and CSA rated

NEC (ECMWeb)

Pliable PVC

Described as flexible version of PVC

Atkore

PVC (implied)

LFNC product listings align with PVC descriptions

Trade Size (Inches)

Metric Size (mm)

Inner Diameter (Approx.)

Outer Diameter (Approx.)

Common Applications

½"

16 mm

~0.62" (15.7 mm)

~0.82" (20.8 mm)

Small wiring, control panels

¾"

21 mm

~0.87" (22.1 mm)

~1.13" (28.7 mm)

HVAC, pumps, outdoor lighting

1"

27 mm

~1.14" (29.0 mm)

~1.44" (36.6 mm)

Industrial machinery, generators

1¼"

35 mm

~1.43" (36.3 mm)

~1.77" (45.0 mm)

Large motors, power distribution

1½"

41 mm

~1.68" (42.7 mm)

~2.05" (52.1 mm)

Heavy-duty equipment, feeders

2"

53 mm

~2.13" (54.1 mm)

~2.52" (64.0 mm)

Large cable runs, solar systems

2½"

63 mm

~2.59" (65.8 mm)

~3.03" (77.0 mm)

Commercial/industrial power

3"

78 mm

~3.13" (79.5 mm)

~3.58" (91.0 mm)

High-capacity wiring, substations

4"

103 mm

~4.13" (104.9 mm)

~4.65" (118.1 mm)

Large-scale industrial use

Industry/Environment

Typical Applications

Key Benefits

HVAC Systems

Protecting wiring in condensers, pumps, and air handlers

Resistant to moisture, oils, and temperature fluctuations

Outdoor Lighting

Wiring for streetlights, garden lights, and signage

UV-resistant, waterproof, and flexible for easy installation

Industrial Machinery

Cable protection in CNC machines, conveyors, and robotic arms

Guards against abrasion, chemicals, and coolant exposure

Marine & Wet Locations

Boat docks, water treatment plants, and irrigation systems

Prevents water ingress and corrosion (non-metallic)

Food & Beverage

Wiring in washdown areas or near processing equipment

Resists grease, sanitizers, and mild acids; easy to clean

Solar Power Systems

Protecting PV panel wiring and connections

Weatherproof, flexible for rooftop routing, and UV-stable

Data Centers

Securing low-voltage cables in raised floors or tight spaces

Non-conductive, reduces EMI interference

Automotive & Wash Bays

Wiring in car washes, vehicle assembly lines, or service pits

Handles high-pressure sprays and automotive fluids

Commercial Buildings

Electrical connections for elevators, escalators, and fire alarms

Flame-retardant options available; meets NEC/UL standards

Renewable Energy

Wind turbine wiring, geothermal systems

Flexible for vibration resistance, durable in harsh weather