PURPOSE: A site glass is provided to easily observe flow of inside fluid by removing foreign materials attached inside a see-through window. CONSTITUTION: A site glass(10) comprises a main body(12), flanges(13,14), and a see-through unit(30). The main body comprises a connection passage(11) which connects pipelines. The flanges are installed in both sides of the main body. The see-through unit is installed in the main body, and comprises a base cover(31), see-through members(32), and a cap(34). The base cover has a see-through hole(31a) and a mounting unit(31b). The see-through hole is communicated with the connection passage. The mounting unit supports a part of the see-through members. The see-through members block the see-through hole. The cap adheres the see-through members to the base cover.
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