SpiroFlex SpiroFlex 75 duct connector (PP) with gasket KR75-PP

The SpiroFlex SpiroFlex 75 duct connector (PP) with gasket KR75-PP is a polypropylene coupling intended for joining circular ventilation and HVAC ducts with a nominal diameter of 75 mm. The connector features an integrated elastomer gasket to create a sealed mechanical joint that reduces air leakage and helps maintain designed airflow. Constructed from corrosion-resistant polypropylene, this coupling is suitable for residential and light-commercial ventilation systems where a durable, gasketed coupling is required.

Advantages

The polypropylene construction offers chemical and corrosion resistance while remaining lightweight and easy to handle. The integrated gasket provides a consistent seal that reduces leakage compared with non-gasketed joints, improving system efficiency and limiting loss of conditioned air. The simple push-fit design enables quick installation without the need for separate sealing materials, and the smooth internal surface supports unobstructed airflow and reduces pressure drop.

Suitable for

• Connecting circular ventilation ducts with 75 mm nominal diameter
• Domestic and light-commercial HVAC systems
• Bathroom and kitchen exhaust lines
• Supply and extract ventilation branches in renovation projects

Key specifications

• Material: polypropylene (PP)
• Nominal diameter: 75 mm
• Integrated elastomer gasket for sealed joint
• Connection type: push-fit gasketed coupling
• Suitable for indoor ventilation use
• Lightweight, corrosion-resistant construction

How to use

Ensure duct ends are cut square and free of burrs or debris before assembly. Align the two duct ends to be joined and insert them into the coupling until the gasket seats evenly around each duct. Apply firm, even pressure to complete the connection; no additional sealant is normally required. Verify the joint is fully seated and visually inspect the gasket line for uniform compression. For added mechanical security in exposed runs, a clamp or band may be fitted over the outside of the coupling in accordance with local installation practices.

Usage recommendations

Use the coupling in temperature and pressure conditions compatible with polypropylene and elastomer gaskets. Avoid prolonged exposure to direct sunlight or external weathering when used in non-protected locations. For systems handling greasy or high-temperature exhaust, confirm material compatibility before installation. Regularly inspect accessible joints for compression integrity as part of routine ventilation maintenance.