Thermaltake Pacific Flow Indicator One Pom + Pmma Safety Valve 5-Blade Interchangeable Flow Indicator Cooling CL-W106-PL00BL-A True high-flow design: both ends with G1/4 thread and five fan blades design, the indicator can be used for any standard fitting. The PMMA cover allows users to directly see through the flow indicator Changeable flow direction: users can freely change the flow direction of the pacific flow indicator one either clockwise or counterclockwise. Plug and play design: No additional tools needed and ready to work in Seconds. Non-restrictive flow design Ideal for transparent coolants