Coliter ® Equal Female Coupling, PN16, 0–120°C, BSP Threaded
GJ3003 Equal Female Coupling – Straight Brass Fitting for Pipe Joining with Internal Threads
The Coliter® GJ3003 Equal Female Coupling is a straight forged brass fitting featuring identical female ISO 228 (BSP) parallel threads on both ends, designed to connect two male-threaded pipes or fittings of the same diameter in hot and cold water plumbing systems. Available in standard sizes such as G1/2"×G1/2", G3/4"×G3/4", and G1"×G1", it is commonly used for pipe extension, alignment, or repair without soldering. Rated for PN16 (1.6 MPa) and suitable for operating temperatures from 0°C to 120°C, it delivers a secure, leak-free connection. Its durable, corrosion-resistant construction ensures long-term reliability in both concealed walls and exposed installations.
Installation diagram
Product Description
| DN | L | L1 | Z | d |
| 16*G1/2“M | 47.5 | 15 | 17 | 16 |
| 20*G3/4"M | 50 | 15 | 17 | 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.
