ITEM NAME:Waterproof Sealing PC Water Cooling System Water Flow Meter Speedometer A#S Product Description Description: Specification: Thread Type: G1/4 Thread Outer Diameter: approx. 12.9 mm/0.51" Material: Acrylic Surface Process: Polish Seal: Stick Suitable for: Monitoring water flow, decoration, etc. Included: 1 X PC Water Cooling System Speedometer.Suitable for: Monitoring water flow, decoration, etc. Material: Acrylic. Surface Process: Polish. If item is defective after 3 months, you can still send it back to us. We will send you a new one after receiving the defective item.