PVC Duct Flexible Couplings

PVC duct flexible couplings are pipe fittings used to join two sections of ductwork together with a secure and flexible connection. The couplings feature stainless steel bands and a flexible gasket like sleeve to create a dynamic, airtight connection. They are primarily used in HVAC systems and industrial applications to connect sections of ductwork for continuous airflow and are often used for dissimilar materials or where movement is expected. Their flexible design works to accommodate misalignments, vibrations, and thermal expansions that can occur within ductwork systems. Flexible PVC duct couplings work by slipping over the ends of duct pipe sections or fittings and securing them with stainless steel clamps. This creates a leakproof and durable seal between the connected parts to maintain system integrity and operation. PVC flexible duct couplings can be used for both permanent and temporary installations. Flexible duct couplings can handle some vibration but are not designed for systems with a lot of movement such as from hardworking equipment. Rigid couplings may make a better choice in these applications. The use of flexible duct couplings provides easier installation and maintenance of ductwork and ventilation systems.

Our PVC flexible duct couplers are USA made by Harrison Machine and Plastic under the trade name SUPERDUCT, one of the nation’s top manufacturers and brands of thermoplastic ductwork. PVC ductwork is to be used with air and compatible gaseous media in non-pressurized applications only. They are not for use in pressure systems, with liquids, or with known incompatible chemicals. Always verify chemical compatibility prior to use.

PVC flexible duct coupling sizes range from 3″ to 24″ in Iron Pipe Size (IPS) diameter. Flexible duct couplers come in sleeve type style. For installation, slip the coupling over the two ductwork sections and use the provided stainless steel tightening bands to securely fix in place. The coupling and tightening bands should support each ductwork section independently and evenly. 

Flexible duct couplings are manufactured from professional grade PVC material per ASTM D1784 specifications and engineered to meet industry quality and safety standards for durability, performance, and compatibility. 

• Material Profile: Type I Grade I PVC Cell Class 12454-B. 
• Color: Dark gray. 
• Performance Standards: Meets and/or exceeds ASTM D testing standards for ductwork applications. 
• Pressure: For non-pressurized systems only. 
• Temperature: Approved for up to 140°F (60°C). 
• Sizing Standard: Schedule 40 / IPS thickness standard. 
• Size Options: Range from 3″ to 24″ in diameter. 
• Connection Options: Sleeve type style with two stainless steel bands.

Harrison SUPERDUCT® flexible couplings offer adaptable connections in space limited setups and the ability to join flexible duct lines or equipment to rigid ductwork. Their PVC construction provides reliable resistance to many commonly handled fumes, gasses, dust, and particulates. They are easy to install and overall durable. SUPERDUCT® flex couplings are lightweight, low cost, and a potentially long term, reliable solution to various maintenance needs and ductwork project challenges.

• PVC Material: Heavy duty thermoplastic with excellent corrosion resistance and durability that will not rust or degrade. 
• Chemical Resistance: Resistant to many acids, alkalis, alcohols and their gasses, fumes, and vapors. 
• Hard Working: Engineered for long term service and minimal maintenance to keep ductwork systems running.
• Adaptive Flexibility: Flexible installation for misaligned duct, equipment vibrations, or repairs. 
• Airtight: Will provide a secure, long lasting seal when properly installed.
• Easy to Install: Unique design allows quick and easy installation without the need for special equipment tools. 
• Low Cost: Relatively inexpensive way to join duct pipelines. 

Common applications and uses for PVC flexible duct couplings include residential, commercial, and industrial HVAC systems for air distribution, worksite ventilation, process waste air, vent connections in bathrooms, kitchens, and exhaust fan systems, alongside air filtration systems, in dust collection and fume removal, indoor agriculture, laboratories, and manufacturing plants.

Harrison PVC SUPERDUCT® flex couplings are a leading choice in quality and performance, trusted by professionals for decades. They are precision engineered to deliver the reliable, long lasting service that ductwork systems require. Manufactured to the highest standards from premium materials, our ductwork pipe supplies are made to exceed requirements. For more information or details on contractor pricing, contact us.