1. Given that it is with 45 mm diameter tube, which enables to hold and speeds up cooling. 2. The 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 , thus, you can to use it. 4. Moreover, the and lower covers are strong glue seals, and the sealing performance is that of ordinary water tanks. 5. For tight connection, advanced G1/4 thread is equipped, so that it can be safety and leak-free. Item Type: Water Tank Application: Computer Case Model Number: Water Cooling PC colour:green material:abs+PMMA size:200 x 40mm Package Contents: 1x water tank 2x half circle 2x screws 2x nut Only the above package content, other products are not included. Note: Light 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.