Features: 1.Given that it is with 45 mm diameter tube, which enables to hold more water and speeds up cooling. 2.The upper and lower covers are high temperature resistant engineering plastics and the transparent part is acrylic. 3.It is because that such a water tank is with practicalilty for long-term attraction, thus, you can feel free to use it. 4.Moreover, the upper and lower covers are strong glue seals, and the sealing performance is better than that of ordinary water tanks. 5.For tight connection, advanced G1/4 thread is equipped, so that it can be safety and leak-free. specification:Item Type: Water Tank Outer Diameter of Water Tank: Approx. 4.5cm / 1.8in Size: 3 holes are G1/4 inner thread Accessories: The water tank only contains 2 half hoops (without any joints and water cooling stopper) PackageList:1 x Water Tank2 x Half Hoop2 x Screw2 x Nut NoteCover is not removable.