Chem Flowtronics unique Sanitary design sight glass designed using standard sanitary piping components modified to support BOROSILICATE safety glass lens. The unique design criteria offers a small retention area above the lens to eliminate the retention areas thus increasing cleanability. Standard material of construction is 316L SS internal and external polished. Other materials of construction are available, please consult with the factory. The unit is supplied with the support cover, lens, and shim gaskets only. No seal gaskets, clamp or ferrule is provided. However, the Model 1100-SS sightglasses can be supplied complete with all of the components you would need to mount to the vessel or piping components. The Model SG-1100-SS is rated for 150 PSIG, (10.3 Barg) which is based on the sandard shim gaskets.