Technical Datasheet arkon flow systems This circular sight glass is ideal for you to visually check the presence, colour and condition of a liquid This model is designed to provide a window for viewing the contents of a vessel or tank. Normally these are welded to the tank, but can be supplied suitable for bolting to a vessel or a pipe flange if required. The windows are toughened borosilicate glass to suit the contents of the vessel. Materials: Stainless steel CE marked and fully PED compliant arkon flow systems