Check the listing for details. Flow Indicator Acrylic Water Cooling Monitoring Red Semicircle G1/4. Condition: New. Listed at 15.23 USD. What is this?The G1/4 standard thread flow indicator is widely used in most computer cooling pipes or water cooling connectors and other water cooling systems.What will I get?The 2-Way semicircle flow indicator, we provide here, is in the size of:Overall Dimensions: 39 x 39 x 23mm/ 1.54 x 1.54 x 0.91 inch(L*W*H)；Thread Dia: G1/4 inch;Color: Red;Material: Acrylic;Surface finish: Polishing;Seal: with silicone sealing ring / adhesive type;In the package: 1 x Flow Water Indicator.Are there any advantages of the product?The water cooling monitoring is made of acrylic material, which is durable. The fan’s silent rotation will always show the direction of the flow, in case that pump stops working and causes overheat.How to use it?Easy to install and use.