100mm Male Duct Coupling

100mm (4") Male Duct Coupling

A small-diameter male coupling for 100mm (4") galvanised steel spiral ducting — joins lengths of rigid duct together, or bridges rigid to flexible sections. Reference: MC/100.

Why growers use this coupling:

• Joins 100mm galvanised steel spiral ductwork — standard industrial-grade small ducting
• Rigid-to-flexible bridging — connect steel spiral to flexible aluminium duct with hose clips
• 100mm / 4" — small-bore size for low-airflow applications or single-tent setups

Who it's not for:

4" is small for grow-room extraction — most setups use 6" (150mm) or 8" (200mm). Only use a 100mm coupling if your whole duct run is also 100mm. For flexible-ducting-only setups, you may not need a rigid coupling at all.

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.