Pressed T-Piece Rigid Ducting Part — Galvanised Steel Junction for Multi-Zone Extraction
Best for: Growers building permanent extraction systems who need to combine or split airflow between growing zones
Our thoughts
This is proper kit for serious extraction work. If you're running a multi-zone setup or building a rigid ductwork system that needs to last, a galvanised steel T-piece is the right call. One we recommend when growers move past flex ducting into permanent infrastructure.
A pressed galvanised steel T-piece designed to join two separate duct runs into a single outlet, or split incoming air between two growing zones. This is the junction component that sits at the heart of any multi-zone extraction system. Made from tough galvanised steel with smooth bore construction, it delivers superior airflow efficiency compared to flexible alternatives and stands up to the moisture-heavy environment of indoor growing without corroding or degrading.
How it compares
T-pieces come in different materials and designs. This one is metal rigid — a professional-grade choice.
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vs. PVC T-pieces: Cheaper to buy, but rigid steel offers significantly better airflow efficiency and lasts considerably longer in permanent installations
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vs. Flexible T-junctions: Flex alternatives are easier to install and cheaper, but they restrict airflow, kink under pressure, and need replacing every 5–7 years. Rigid steel works for 15+ years with zero maintenance
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vs. Reducing T-pieces: This is an equal T-piece — all three connections share the same diameter. If you need to step down duct sizes, you'd use a reducer instead
Bottom line: if you're building something that needs to be efficient and permanent, rigid galvanised steel is the right material.
Usage guidance
A T-piece works in two main ways depending on your extraction layout:
Combining airflow from two zones
Run ducting from two separate grow areas into the two end branches of the T, then out through the centre outlet to your extractor fan and carbon filter. This is how you handle multi-room setups without running separate extraction lines.
Splitting incoming air to two zones
Pull fresh air through the main inlet and split it between two growing areas. Less common than combining, but useful if you're running intake ducting across multiple spaces.
Installation best practice
Connect the T-piece to rigid ducting using female-to-female couplings (the coupling sits over the male spigot end of the T-piece). Seal any gaps with duct tape or a jubilee clip for an airtight joint. Keep ducting runs as short and straight as possible — wrinkles and bends lose you efficiency. The smoother the bore, the less work your extractor fan has to do.
System layout tips
In hybrid systems, it's common to run rigid metal ducting as your main trunk and branch off with flexible runs to individual areas. The T-piece is where that main trunk splits or joins. Rigid metal handles the heavy lifting; flex handles the flexibility.
Technical specifications
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Material: Galvanised steel
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Design: Equal T-piece (all three connection points the same diameter)
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Connection type: Male spigot ends, paired with female-to-female couplings
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Available sizes: 100mm, 125mm, 150mm, 160mm (matches standard rigid ductwork diameters)
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Bore construction: Smooth internal bore for optimised airflow
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Durability: Corrosion-resistant galvanising suitable for high-moisture environments
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Temperature range: -15°C to +60°C (standard UK building specification)
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Installation: Requires female-to-female couplings and duct tape or jubilee clips for sealing
Who this is for
- Growers moving from flexible to rigid extraction infrastructure
- Multi-zone operations where you're extracting from two separate growing areas into one line
- Permanent installations where equipment will stay in place for years
- Anyone who prioritises system efficiency and wants to minimise extractor fan workload (and electricity bills)
- Hybrid system builders running rigid trunk ducting with flex branches to individual spaces
Not ideal if you need quick, temporary, or frequently reconfigured setups — flex ducting does that job better.
Our take
This is proper kit for serious extraction work. Galvanised steel T-pieces cost more upfront than PVC or flex alternatives, but they deliver better airflow, last 15+ years without degradation, and handle the moisture in growing environments without any fuss. If you're building a multi-zone system or upgrading from flex into permanent rigid infrastructure, this is exactly what you need.
