Greddy Radiator Hose Water Temp Sensor Adapter. Sizes are available from 30mm to 40mm outer diameter. Great for Greddy temp sensors and electronic gauges.

Outer Diameter Sizes:

• 16401630 - 30mm.

For 1/8 PT (BSPT) Temp sensor.  This is the typical size you will find in Japanese brand gauges.

Please not this is not the same size as the 1/8 NPT.