GReddy This is an attachment with a 1/8BSP (JDM 1/8PT) hole for attaching a thermometer or water temperature gauge sensor to the radiator upper hose.
The material is aluminum and has a blue anodized color, so you can enjoy coordinating it with other Greddy products
Allows for easy mounting of GReddy 1/8BSP (JDM 1/8PT) Temperature Sensors in: 30mm, 32mm, 36mm, 38mm, or 40mm inner diameters for Upper Radiator Hose (or 1/8BSP pressure line fitting for GReddy Radiator Breather Tank - Lower Hose)
Commonly use with GReddy: Meters, Informeter Touch w/ Sensor Adapter, 60mm Warning Temp Meters, 60mm Electronic Temp Meters and 52mm Electronic Temp Meters and Radiator Breather Tank