China Good quality Hot-Selling CT-Ec 1/2″ Flexible Conduit Coupling UL1653-Certified for Use with Ent Slab-Box

Product Description

Product Description

Product Details

Ctube Flexible ENT coupling is sturdy and durable, with excellent properties such as tensile strength, punching resistance, water absorption, etc., and we are a UL Listed manufacturer widely recognized in the industry. Such coupling is used for conneting ENT flexible conduits.
For over 10 years, we have been committed to offering the best PVC conduit for commercial, residential, and public facilities. ENT flexible conduit pipes and fittings can be used in underground, floor, and outdoor environments and will provide years of maintenance-free use. Compared with metal conduits, PVC electrical conduits have the pros such as light weight, good insulation,  sunlight resistance, and lightweight. They are also the best choice for commercial and residential projects.
UL & CSA Approved. UL 1653 & CSA approved electrical PVC conduit pipes and fittings are prefect match with your project & wholesales in US & CA market. 
UL 94V-0 FIRE RATING. No flaming once cut off the fire source means the greatest fire rating in the industry. 
NON-METALLIC PVC PIPE. heat-,corrosion-,fire-,sunlight-,rust resistant are pros for ENT flexible conduits. 
MULTI-PURPOSE. Whether you routing the electrical wiring conduits aboveground or underground, they both work well.
CUSTOMIZED SERVICES. Thickness and color can be customized to 100% meet your business requirement.


Tensile Strength 5000 CHINAMFG (3.45 kN/cm2)
Extrusion Fusion
Water Absorption <0.50% of Whole Weight After Soak
Resistance to Crushing ID≥70% After Test
Resistance to Impact Less Than 3 of 1/32 inch Cracks &   Tears
Deflection under Load <0.25mm Deformation
Fire Rating UL 94 V-0
Resistance to Specific Reagents Less ±2.50% Weight After 60 / 120 Days Soak
Permanency of Printing Yes
Rust & Sunlight Resistant Yes
Color Grey or Customized
Material UPVC
Customized Services Available 
Place of Origin HangZhou, China
Shipping By sea
Samples Available
Length As per standard, or customized

Quality Assurance
Ctube applied a strict quality management system such as ISO9001:2015 to control the quality of products, and we have established a stricter quality audit system within the factory to ensure that the quality of the products you buy is in the best condition.
At the same time, our products comply with UL, CSA, AS/NZS, IEC and other organizational standards, which can ensure that you can buy high-quality products.

Ctube flexible ENT couplings are sunlight resistant and used exposed, encased in concrete, concealed in walls, and in direct burial applications including systems for:
– Utilities;
– Cable, data, and communication lines;
– Institutional, commercial, and industrial buildings;

Size Chart

Nominal Size Item No. L (in) H (in)
1/2 CT-EC 1.988 1.213
3/4 CT-EC 2.047 1.417
1 CT-EC 2.343 1.764


Company Profile

Manufacturing Capability

– Production capacity: 50000 pieces per week
– Packaging methods: plastic bags & PE films, by carton box

Ctube is a professional and leading manufacturer for electrical conduit pipes and fittings in China.
Ctube is the first UL & CSA approved manufacturer in China.
Ctube is the only manufacturer for CSA DB2 conduit in China.

Our products are widely used for cable wiring protection,mainly includes asfollowing:
(1)  UL651 rigid PVC conduit, DB120 PVC conduit,UL1653 ENT, and fittings;
(2)   CSA rigid PVC conduit, DB2/ES2 PVC conduit,ENT, and fittings;
(3)   AS/NZS 2053 PVC conduit and fittings;
(4)   Extremely UV resistant Solar conduit andfittings;
(5)   Low smoke halogen free conduit and fittings.
(6)  IEC 61386 rigid PVC conduit, ENT, andfittings.



Quality Certification:

– UL Listed
– Compliance with CSA, ETL, and ASTM

Our Advantages




Packaging & Shipping



1. What is your MOQ?
    – The MOQ of this product is usually 3000 pieces.
2. What is your delivery time?
    – It depends on the location. Normally the delivery time is around 15-30 days in North America.
3. What is the shipping port?
    – We usually ship the cargo via HangZhou Port.
4. What is your payment term?
    – We accept T/T, or L/C,can be negotiated.
5. How should I contact you?
    – You can contact us by submitting an inquiry form here. → contact us
6. How about the samples?
    – Normally we can provide free samples unless you require too many. 

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flexible coupling

What are the common installation mistakes to avoid when using flexible couplings?

Proper installation is crucial for the reliable and efficient performance of flexible couplings. Here are some common installation mistakes to avoid:

  • Incorrect Alignment: One of the most critical installation errors is improper alignment of the driving and driven shafts. Misalignment can lead to premature wear, increased vibration, and reduced power transmission efficiency. It is essential to align the shafts within the specified tolerances provided by the coupling manufacturer.
  • Over-Tightening: Applying excessive torque to the coupling’s fasteners during installation can cause damage to the flexible elements and decrease their ability to accommodate misalignment. It is essential to follow the recommended torque values provided by the coupling manufacturer to ensure proper clamping without over-tightening.
  • Improper Lubrication: Some flexible couplings may require lubrication of their flexible elements or moving parts. Failure to lubricate as recommended can lead to increased friction, wear, and reduced service life of the coupling.
  • Using Damaged Couplings: Before installation, it is crucial to inspect the flexible coupling for any signs of damage or defects. Using a damaged coupling can lead to premature failure and potential safety hazards. If any damage is detected, the coupling should be replaced with a new one.
  • Wrong Coupling Selection: Selecting the wrong type or size of the coupling for the application can result in inadequate performance, premature wear, and possible coupling failure. It’s essential to consider factors such as torque requirements, speed, misalignment compensation, and environmental conditions when choosing the appropriate coupling.
  • Ignoring Operating Conditions: Failure to consider the specific operating conditions, such as temperature, humidity, and exposure to corrosive substances, can lead to accelerated wear and reduced coupling lifespan. Choosing a coupling that is compatible with the operating environment is essential.
  • Ignoring Manufacturer Guidelines: Each flexible coupling comes with specific installation guidelines provided by the manufacturer. Ignoring these guidelines can lead to suboptimal performance and potential safety issues. It is crucial to carefully follow the manufacturer’s instructions during installation.

By avoiding these common installation mistakes and following best practices, the reliability, efficiency, and service life of flexible couplings can be maximized, leading to improved performance of the mechanical system as a whole.

flexible coupling

What are the factors influencing the thermal performance of a flexible coupling?

The thermal performance of a flexible coupling can be influenced by several factors, including:

  • Material Composition: The material used in the construction of the flexible coupling can impact its thermal performance. Different materials have varying thermal conductivity and heat resistance properties, which can affect how well the coupling dissipates heat generated during operation.
  • Operating Speed: The rotational speed of the flexible coupling can influence its thermal behavior. Higher speeds can result in increased friction, leading to more heat generation. Couplings designed for high-speed applications often incorporate features to manage and dissipate heat effectively.
  • Power Transmission: The amount of power transmitted through the flexible coupling plays a role in its thermal performance. Higher power levels can lead to increased heat generation, and the coupling must be designed to handle and dissipate this heat without compromising its integrity.
  • Environmental Conditions: The ambient temperature and surrounding environment can impact the thermal performance of the flexible coupling. In high-temperature environments, the coupling may need to dissipate heat more efficiently to avoid overheating.
  • Lubrication: Proper lubrication is essential for managing friction and heat generation within the coupling. Insufficient or inappropriate lubrication can lead to increased wear and heat buildup.
  • Design and Geometry: The design and geometry of the flexible coupling can influence its thermal performance. Some coupling designs incorporate features such as cooling fins, ventilation, or heat sinks to enhance heat dissipation.
  • Load Distribution: The distribution of loads across the flexible coupling can affect how heat is generated and dissipated. Proper load distribution helps prevent localized heating and reduces the risk of thermal issues.

Manufacturers consider these factors during the design and selection of flexible couplings to ensure they can handle the thermal demands of specific applications. Proper application and maintenance of the flexible coupling are also essential for optimizing its thermal performance and overall efficiency.

flexible coupling

What materials are commonly used in manufacturing flexible couplings?

Flexible couplings are manufactured using a variety of materials, each offering different properties and characteristics suited for specific applications. The choice of material depends on factors such as the application’s requirements, environmental conditions, torque capacity, and desired flexibility. Here are some of the commonly used materials in manufacturing flexible couplings:

  • Steel: Steel is a widely used material in flexible couplings due to its strength, durability, and excellent torque transmission capabilities. Steel couplings are suitable for heavy-duty industrial applications with high torque requirements and harsh operating conditions.
  • Stainless Steel: Stainless steel is often used to manufacture flexible couplings in environments with high corrosion potential. Stainless steel couplings offer excellent resistance to rust and other corrosive elements, making them ideal for marine, food processing, and chemical industry applications.
  • Aluminum: Aluminum couplings are lightweight, have low inertia, and provide excellent balance. They are commonly used in applications where reducing weight is critical, such as aerospace and robotics.
  • Brass: Brass couplings are known for their electrical conductivity and are used in applications where electrical grounding or electrical isolation is required, such as in certain industrial machinery or electronics equipment.
  • Cast Iron: Cast iron couplings offer good strength and durability and are often used in industrial applications where resistance to shock loads and vibrations is necessary.
  • Plastic/Polymer: Some flexible couplings use high-performance polymers or plastics, such as polyurethane or nylon. These materials provide good flexibility, low friction, and resistance to chemicals. Plastic couplings are suitable for applications where corrosion resistance and lightweight are essential.
  • Elastomers: Elastomers are used as the flexible elements in many flexible couplings. Materials like natural rubber, neoprene, or urethane are commonly used as elastomer spider elements, providing flexibility and vibration damping properties.

The selection of the coupling material depends on the specific needs of the application. For instance, high-performance and heavy-duty applications may require steel or stainless steel couplings for their robustness, while applications where weight reduction is crucial may benefit from aluminum or polymer couplings. Additionally, the choice of material is influenced by factors such as temperature range, chemical exposure, and electrical requirements in the application’s operating environment.

Manufacturers typically provide material specifications for their couplings, helping users make informed decisions based on the specific demands of their applications.

China Good quality Hot-Selling CT-Ec 1/2China Good quality Hot-Selling CT-Ec 1/2
editor by CX 2024-04-25