... , steel black bezel(two screws )with glass window Note:1.There are radial and axial for selecting 2.Thread :NPT,BSP,BSPT etc ... Φ100 5.Flange Φ40,Φ50,Φ63,Φ100 and Φ160Special versions:1.With retard scale spacing ,adjustable green sector and red mark pointer ... for heating systems,2.With additional temperature scale for refrigerants in °C3.With othe unit according requirement,such as ...