Reducing Compression Union Male (3mm to 25mm Range)
Secure & Reliable Pipe Connections Across Various Diameters
The Reducing Compression Union Male is an essential fitting for joining two compression pipes of different sizes. With a robust mechanical seal, these fittings offer fast, reliable connections without the need for heat or soldering—ideal for applications in plumbing, instrumentation, and light industrial systems.
Made from high-quality materials, this union is designed for durability and consistent performance in both residential and commercial systems. It features a male insert (MI) side and a compression nut (CN) side, allowing precise adaptation between pipe sizes.
Product Features:
- Strong & Durable: Engineered for long-term use with corrosion-resistant materials.
- Leak-Free Design: Creates a tight mechanical seal under pressure.
- Simple Installation: Easily installed using standard spanners—no welding required.
Available Size Variants (MI x CN):
| Product Code | Description | Size (MI x CN) |
|---|---|---|
| FCF0001 | UNION 3MM MI X 6MM CN MUN | 3mm MI x 6mm CN |
| FCF0007 | UNION 6MM MI X 9MM CN MUN | 6mm MI x 9mm CN |
| FCF0009 | UNION 9MM MI X 6MM CN MUN | 9mm MI x 6mm CN |
| FCF0012 | UNION 9MM MI X 12MM CN MUN | 9mm MI x 12mm CN |
| FCF0013 | UNION 9MM MI X 20MM CN MUN | 9mm MI x 20mm CN |
| FCF0017 | UNION 12MM MI X 9MM CN MUN | 12mm MI x 9mm CN |
| FCF0019 | UNION 12MM MI X 20MM CN MUN | 12mm MI x 20mm CN |
| FCF0020 | UNION 12MM MI X 25MM CN MUN | 12mm MI x 25mm CN |
| FCF0022 | UNION 20MM MI X 12MM CN MUN | 20mm MI x 12mm CN |
| FCF0024 | UNION 20MM MI X 25MM CN MUN | 20mm MI x 25mm CN |
| FCF0027 | UNION 25MM MI X 12MM CN MUN | 25mm MI x 12mm CN |
| FCF0028 | UNION 25MM MI X 20MM CN MUN | 25mm MI x 20mm CN |
Ideal For:
- Reducing or adapting between pipe sizes
- Tight-space installations
- Plumbing, HVAC, gas, or compressed air systems
- Use with copper, nylon, or plastic tubing (check compatibility)
Whether you're connecting different line sizes in residential systems or industrial pipework, the Reducing Compression Union Male ensures a reliable seal and strong flow performance.
We aim to dispatch all orders within 1 business day
*Large items may be delivered to a local depot if required.
You may also like
What our customers say
View allGot questions about this product?
Head over to our Frequently Asked Questions (FAQs) page for more details on ordering, delivery, installation, and warranties — or reach out to our team for personalised help
Local Delivery Available
Flat rate Local Burdens Delivery on ANY order, large or small, direct to your door.
Find Out More
Free In-store Collection
Free in-store collection available at any Burdens Bathrooms location
Free In-store Collection




















