Coliter ® Reducing Male Coupling, PN16, 0–120°C, BSP Threaded
GJ3006 Reducing Male Coupling – Brass Fitting for Pipe Diameter Transition with External Threads
The Coliter® GJ3006 Reducing Male Coupling is a straight forged brass fitting featuring male ISO 228 (BSP) parallel threads of different sizes on each end, designed to connect pipes or fittings of unequal diameters in plumbing systems. Common configurations include G1/2"×G3/4", G3/4"×G1", and similar combinations, enabling direct integration between smaller fixture connections and larger supply lines. Rated for PN16 (1.6 MPa) and suitable for operating temperatures from 0°C to 120°C, it ensures a secure, leak-free joint without additional adapters. Its compact and corrosion-resistant design makes it ideal for space-constrained installations in bathrooms, kitchens, and HVAC applications.
Installation diagram
Product Description
| DN | L | L1 | Z | d |
| 16*G1/2“F | 44.5 | 15 | 11 | 16 |
| 20*G3/4"F | 50 | 16.5 | 11 | 20 |
Technical Specifications
Nominal Pressure: 1.6 MPa
Working Medium: Hot and Cold Water
Working Temperature: 0℃ ≤ t ≤ 120℃
Pipe Threads: ISO 228
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Faq - Frequent questions
Introduction to Coupling
Coliter® offers a complete series of brass coupling fittings, including equal couplings (e.g., GJ3005), reducing female couplings (GJ3006), reducing male couplings (GJ3003), and female unions (GJ3007)—designed for secure, leak-free pipe extension and repair in potable water and heating systems. Made from high-quality forged brass with lead-free compliance (<0.25% pb="">ISO 228 parallel threads (G1/2", G3/4", G1") and are rated for PN16 (1.6 MPa) at temperatures up to 120°C. Ideal for connecting same-size or different-size pipes without welding—ensuring quick installation, corrosion resistance, and long-term reliability in residential and commercial plumbing.
