A sight glass(cup) is a transparent window or tube installed in a piping system or vessel to allow visual observation of the process. It is commonly used in fluid systems and equipment to monitor liquid levels, flow rates, and the presence of bubbles or contaminants. The sight glass provides operators with a quick and easy way to assess the condition and performance of the system without the need for physical access or disassembly. CNZPV offer a range of sight glasses for both industrial and hygienic process applications.