1The upper and lower covers are high temperature resistant engineering plastics and the transparent part is acrylic. 2Moreover, the upper and lower covers are strong glue seals, and the sealing performance is better than that of ordinary water tanks. 3It has a 45 mm diameter tube that allows the tank to hold more water and speeds up heat dissipation. 4Equipped with advanced G1 / 4 thread for tight connection, it can be safety and leak-free. 5With practical and long-term attraction. You can use it with confidence for long time. Item Type: Water TankOuter Diameter of Water Tank: Approx. 4.5cm / 1.8inWater Tank Size: Approx. 150mm / 5.9inWater Tank Capacity: 210mlSize: 3 holes are G1/4 inner threadAccessories: The water tank only contains 2 half hoops (without any joints and water cooling stopper) 1 x Water Tank2 x Half Hoop2 x Screw2 x Nut