china no hub coupling manufacturer
Compliant with the CUPC, ASTM C1277
A no hub coupling is a flexible pipe connector used to join cast iron, PVC, copper, or ABS pipes without the need for a hub or flange. It provides a secure and leak-resistant connection, making installation faster and easier in plumbing, drainage, and ventilation systems.
HWKG, a brand under Hengwei Hose Clamp Co., Ltd, is a professional no hub coupling manufacturer established in 2001 in Yuyao, Ningbo, Zhejiang, China. With over 20 years of experience and a 35,000-square-meter factory, HWKG has become one of the leading suppliers of hose clamps and pipe coupling products in China.
HWKG's three types of No-hub coupling
HWKG supplies three graded hubless couplings covering light, medium and heavy pipeline loads, matching various indoor and underground drainage engineering scenarios.
standard no hub pipe coupling
Our standard no hub pipe coupling serves as our mainstream basic model equipped with single locking clamp and lightweight stainless steel shield. All production follows CISPI 310 specifications with strict factory inspection. It delivers stable watertight sealing for light-load indoor residential drainage, compatible with cast iron, PVC and ABS pipes for new residential buildings and simple household renovation projects.
medium duty no hub pipe coupling
HWKG optimizes medium duty couplings with thicker protective shields and strengthened clamping bands to enhance overall compression and anti-vibration performance. This product handles moderate pipeline pressure and flow fluctuation, widely applied in mid-rise apartments, shopping malls and public restrooms, offering durable leak-proof connection for most conventional commercial sewage drainage systems.
heavy duty no hub coupling
Our heavy duty no hub coupling adopts ultra-thick stainless steel outer shield and double locking clamps for outstanding structural toughness. It resists heavy buried soil pressure, high water load and long-term vibration, professionally developed by HWKG for industrial drainage pipelines, underground municipal sewage lines and large-scale commercial complex construction projects.
hwkg no hub coupling technical specifications
Check complete dimension, clamp and material data of HWKG no-hub couplings. Standard, medium, heavy-duty and reducing models all have clear technical tables for quick engineering selection.
- Patented Bi-Directional Shield Design
- Connects Cast lron Pipe to Cast lron Pipe
- Specially Beaded Gasket
- Interlocking Clamp Design
- Floating Eyelet Design
standard no hub pipe coupling specification table
medium duty no hub pipe coupling specification table
heavy duty no hub coupling specification table
reducing size no hub coupling specification table
key advantages of no hub coupling
superior watertight sealing performance
HWKG no hub connectors use high-elastic neoprene rubber sleeves. Uniform clamping force creates full-surface compression fit between pipes. Strict water pressure testing ensures stable watertight effects, avoiding seepage even under long-term continuous drainage operation.
easy and quick installation process
No welding, glue or complex special tools are required. Simply fit the rubber sleeve, cover the shield and fasten clamps. One worker can finish a pipe joint within minutes to cut construction labor costs significantly.
excellent pressure and load resistance
Thickened stainless steel shields and reinforced worm-drive clamps greatly boost structural strength. All items pass strict load and pressure aging tests, adapting to underground burial and medium-to-high pressure sewage drainage environments reliably.
effective leakage prevention design
Our integrated metal shield evenly distributes tightening pressure without local gasket deformation. The anti-slip clamp structure locks the rubber sleeve tightly. This elaborate structural design eliminates common leakage risks at pipeline joints thoroughly.
noise and vibration reduction capability
The soft rubber sleeve acts as an effective buffer layer to absorb pipeline vibration and running water noise. It blocks sound transmission along pipes, bringing quiet drainage experience for apartments, hotels and commercial buildings.
compatibility with multiple pipe materials
Our flexible hubless connectors perfectly connect cast iron, PVC, ABS and copper drainage pipes. The adjustable elastic inner sleeve fits various outer diameters, meeting mixed-material piping needs in renovation and new construction projects.
no hub coupling in different applications
HWKG offers 1″–10″ hubless couplings that feature patented bi-directional shielding technology, which maximizes the transfer of pressure from the clamp to the gasket and pipe. This design provides a more efficient and reliable connection, effectively replacing traditional, less efficient hub-and-spigot joints. The following sections highlight the specific applications of no hub pipe couplings in various piping scenarios.
pvc to cast iron no hub coupling
This transition hubless coupling matches the outer diameters of PVC drain pipes and cast iron soil pipes. The elastic rubber sleeve achieves tight sealing, widely used for old cast iron pipeline renovation and new residential DWV drainage transformation projects.
cast iron to abs no hub adapter
HWKG cast iron to ABS adapter solves connection gaps between traditional cast iron pipes and lightweight ABS drain tubes. Stable sealing performance fits kitchen, bathroom wastewater pipelines in commercial and residential decoration works.
cast iron to cast iron no hub coupling
Designed for connecting two hubless cast iron soil pipes, this coupling equips standard rubber gaskets and stainless steel shields. It meets CISPI industry standards and serves main sewage pipelines of high-rise buildings.
no hub coupling pvc to copper
The flexible inner rubber layer can adapt to the different outer sizes of PVC plastic pipes and copper tubes. It provides leak-free transition joints for mixed-material plumbing systems in house reconstruction and hotel renovation projects.
Why choose HWKG as your no hub coupling supplier?
Our production, R&D and certification strengths support stable bulk orders worldwide.
advanced manufacturing and innovation capability
strong r&d and technical expertise
certified quality and global recognition
FAQ about no hub coupling
Can you provide customized size & OEM service for no hub couplings?
We support custom reducing sizes, logo printing, packaging OEM and ODM development. Our R&D team designs exclusive coupling structures to meet special project demands for engineering contractors and wholesale distributors.
What certifications do your hubless pipe couplings have for North American projects?
All our flexible couplings comply with CISPI 310 standard, with complete CUPC and ISO quality certifications. The full certification documents can be provided for project inspection and customs clearance for overseas bulk orders.
What is your mass production lead time for bulk wholesale orders?
Our automated production lines ensure stable output. For standard models, delivery takes 7–15 working days after deposit. Custom OEM orders will confirm exact schedules separately according to drawing and quantity requirements.
Contact us for a quote on no hub coupling
With full size ranges, custom OEM service and fast bulk delivery support, send your pipe size and project requirements to HWKG team to get competitive factory-direct quotation of high-performance hubless couplings.
Guide to no hub coupling
Browse our complete flexible hubless coupling guide, covering core definitions, step-by-step installation steps and key tips to select suitable couplings for your drainage projects.
What is No-hub cast iron coupling?
Also known as hubless coupling, it is a flexible pipeline connector made of neoprene rubber sleeve, stainless steel shield and locking clamps. It connects different drainage pipes without welding, widely used in residential and commercial DWV sewage systems.
How do you install a hubless pipe coupling
Cut pipes flatly and thoroughly remove burrs, rust and sharp edges on outer walls. Wipe off dust and debris to prevent hard scraps from scratching rubber sleeves and triggering hidden water leakage after installation.
Prepare the pipe ends
Cut pipes flatly and thoroughly remove burrs, rust and sharp edges on outer walls. Wipe off dust and debris to prevent hard scraps from scratching rubber sleeves and triggering hidden water leakage after installation.
Position the rubber sleeve
Slide the elastic rubber sleeve to the middle position of two aligned pipe ends. Ensure the sleeve fully covers the pipe gap, forming an intact sealing buffer layer to lay a solid foundation for leak-proof connection.
Install the metal shield and clamps
Wrap the stainless steel protective shield outside the rubber sleeve, then mount matching clamps evenly around the shield. Evenly distributed accessories can deliver balanced pressure during subsequent tightening operation.
Tighten and test the connection
Tighten clamp screws with standard torque tools to specified tightness. Fill the pipeline with water for a pressure test, check the joint surface carefully to confirm no seepage or dripping problems.
how to choose no hub coupling?
Three key factors decide your suitable coupling model. Confirm pipe size and material first, check matching industry certifications, then select standard, medium or heavy-duty shields based on pipeline load and service environment.
Match Pipe Size and Material
Measure the outer diameter of drainage pipes accurately before selection. Our couplings fit cast iron, PVC, ABS and copper pipes, pick the corresponding transition model according to two connected pipe materials.
Verify Standards and Certifications
Confirm the coupling complies with local pipeline industry standards such as CISPI 310. Authorized certifications like CUPC prove stable quality and meet the acceptance requirements of global construction projects.
Choose Between Standard and Heavy-Duty Shields
Light indoor drainage uses standard thin shields; medium vibration scenarios select medium-duty types. Underground and industrial high-load pipelines require thickened heavy-duty shields for long-term stable performance.
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