Application: Can be applied to Thermaltake BigWater and other liquid cooling system For 5.25 drive bay : the indicator can fit into two 5.25" drive bays in the case Quick Install Connectors: The connection of the temperature probe is suitable for tubing of 6.4 to 9.5 mm to inner diameter. Water level : Transparent window indicate the level of the water Water flow : indicate the movement of the liquid Mounting Plates : Stylish front plate is designed to attach the indicator within two 5.25" drive bays