EK CSQ Compression Fitting is a real high flow fitting. Made of Nickel -plated brass with quality O-ring. A unique design with side imprinted EK logo will give your watercooling system a higher value. Technical data: - Thread: G1/4 - G1/4 thread length: 4,5 mm - Outer diameter of a fitting: 22 mm - Length: 27 mm For tubes: - Inner diameter: 9,5 mm (3/8\) - Outer diameter: 12,7 mm (1/2\)