1. Plastic Casing; 2. High quality and good price; 3. DN:23mm, 25mm, ... Be Provided As Requested);2. Casing: Plastic Casing( S.Steel Casing would be provided);3. Diameter of the Casing: 1.5'', 2.0'', 2 ... , Thermal Meter, Air Test Gauge, Water Test Meter etc. Plastic Casing Pressure Gauge