1, the main advantages of the sight glass is accurate, reliable, easy to use, no energy or power supply. 2、Sight glass can be installed inside the pipeline without dismantling the pipeline, which is convenient for maintenance and repair. 3、Cleaning treatment. Before use, you can use the appropriate amount of alcohol cotton in its surface lightly wiped, note: do not use acidic liquids for cleaning, so as not to corrode the outer surface of the glass. 4, the sight glass of the sight glass belongs to the desirable damage parts, the installation of the sight glass should be carefully and gently 5, and the metal should be gasket between, in order to seal, shockproof.