Features: 1.[Unique Design] Using 3 pre installed O rings and a unique design, this hard tube fitting has become the new standard of assembly technology. 2.[Thread] Using sophisticated production technology, with fine workmanship, the thread of the water stop plug is external G1/4in. 3.[5 Colors Available] There are 5 colors you can choose, including silver, white, black, red and blue, you can pick according to your preference. 4.[Convenient Practical] The smaller end is used to grip the C?Pro Series compression fittings, providing an easier and faster way to turn the fitting 5.[Easy Installation] By rethinking and adapting the traditional compression fitting design, this new hard tube fitting makes it easier to install. specification:Item Type: Hard Tube Fittings Material: The Main Body is High-quality First Class Brass, and the Color Outer Cover is Aluminum Alloy Model: BYGKN-C14 : Thickness Approx. 9.3mm / 0.4in(Including Thread), Outer Diameter: Approx. 18mm / 0.7in Thread: Male G1/4in Accessories: White Silicone Sealing Ring (Installed), Black Sealing Ring (Spare) (White is Long Life Silicone Sealing Ring, Black is High Temperature Resistant Sealing Ring) Fixing Method: Inner Hex M8 Fixed Sealing Method: Built in 2 Sealing Rings, External 1 Sealing Ring Surfaces Treatment: Electroplating, Electrophoresis PackageList:1 x Hard Tube Fittings 3 x Sealing Rings