Coliter ® Equal Male Coupling, PN16, 0–120°C, BSP Threaded
GJ3003 Equal Male Coupling – Straight Brass Fitting for Pipe Extension with External Threads
The Coliter® GJ3003 Equal Male Coupling is a straight forged brass fitting featuring identical male ISO 228 (BSP) parallel threads on both ends, designed to connect two female-threaded pipes or fittings of the same diameter in hot and cold water systems. Common sizes include G1/2"×G1/2", G3/4"×G3/4", and G1"×G1", making it ideal for pipe extension, alignment, or repair in residential and commercial plumbing. 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 welding or soldering. Its robust, corrosion-resistant construction guarantees reliable performance in both concealed and exposed installations.
Installation diagram
Product Description
| DN | L | L1 | Z | d |
| 16*G3/4“M | 49 | 15 | 17 | 16 |
| 20*G1/2"M | 50 | 16.5 | 17 | 20 |
Technical Specifications
Nominal Pressure: 1.6 MPa
Working Medium: Hot and Cold Water
Working Temperature: 0℃ ≤ t ≤ 120℃
Pipe Threads: ISO 228
Product Inquiry
We will contact you within one working day. Please pay attention to your email.
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.
