Features: Extended thread design, strong installation fit, prevents water leakage, and prevents the water pipe from pressing against the gate during installation. Make of copper material, with uniform wall thickness, wear resistance, and high strength. Standard calibers, large diameter, sufficient water flows. Strong stability, pressure and explosions resistance. Suitable for temperatures ranging from -20℃ to 120℃, applicable to water, oil, and steam. Specifications: Materials: Copper Size: 16x16/20x20/25x25(Optional) 16x16 mouth diameter: about 16mm/0.63inch 20x20 mouth diameter: about 20mm/0.79inch 25x25 mouth diameter: about 25mm/0.98inch Package Includes: 1pc Elbow Connector note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.