This is an Inline Fitting for the 6AN lines. It has an 1/8npt port for an Oil Temp/Pressure Gauge. Quickly install/uninstall for testing purposes or for gauges you want to keep. PLUS - This item has a swivel base so you can point the 1/8npt outlet in the direction you need. This is such a Great Item! (The brass fitting is ONLY for showing the 1/8npt port-it is not included).