Our KTN 721 sight glass is made of a 1.4008 (CF8M) stainless steel body and tempered glass sight glass, flange connections DIN / ANSI . The sight glass has a swirl tab to visualize fluid movement. Our size range covers from DN15 to DN100. The working pressure range is class 800 / PN63. The maximum working temperature is 200ºC at 10kg / cm2 .