1. Practical, it can be used in confidence for long time, which is long-term . 2. While with acrylic transparent part, upper and lower covers are made of high temperature engineering plastics. 3. It has a 45 mm diameter tube that allows the tank to hold and speeds up heat dissipation. 4. Such a water cooling device is equipped with advanced G1 or 4 thread for tight connection, which can be safety and leak-free. 5. Moreover, the upper and lower covers are strong glue seals, and the sealing performance is that of ordinary water tanks. Item Type:Water Tank Outer Diameter of Water Tank:. 4.5cm or 1.8in Size:3 holes are G1 or 4 inner thread Accessories:The water tank only contains 2 half hoops (without any joints and water cooling stopper) Water Tank Size:150mm Colour: Material:ABS Package Contents: 1 x Radiator Accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.