Female Duct Coupling — 100mm Galvanised Spiral Duct Connector

Female Duct Coupling — 100mm Galvanised Female-to-Female Connector

Galvanised female-female coupler designed for use in 100mm galvanised ducting systems — joins two male ducting fittings together (such as bends, T-pieces, or reducers). You can also use an offcut of galvanised spiral ducting instead, or attach flexible ducting to the female coupler. The essential connector for permanent galvanised ducting installations where rigid runs need joining.

Why growers need Female Duct Couplings:

• 100mm (4") galvanised duct coupler — fits 100mm rigid spiral duct
• Galvanised steel construction — corrosion-resistant in humid grow rooms
• Joins two male fittings — bends, T-pieces, reducers connect through this
• Compatible with flexible ducting — also accepts flexible combi duct
• Permanent installation use — proper engineering for fixed runs
• Essential for rigid duct systems — every galvanised run needs couplers
• Affordable connection fitting — proper fitting at accessible cost

Who it's not for:

Specifically for 100mm (4") ducting — for 125mm (5"), 150mm (6"), 200mm (8"), etc., check matching coupler sizes. For pure flexible-to-flexible joining, simple Jubilee Clips or METU Pro Fast Clamps with a duct sleeve are simpler. For acoustic ducting joins, Phonic Trap-specific fittings may seal better. Check fit before installation — galvanised dimensions can vary slightly between manufacturers.

In stock now — ships same working day from our Staffordshire warehouse with free UK delivery over £100. Pick up in-store at our Stone shop (ST15 0SR) if you're local, or click & collect at checkout.