These 4 piece sight glasses can hold high vacuum levels on a system with KF connections. The housing is made of 304 stainless steel with a viton x-profile seal. The glass is tempered, impact resistant glass that increases the longevity of the sight glass. The connection sizes available are:

• KF25 (NW25)
• KF40 (NW40)
• KF50 (NW50)

*Light assembly may be required with a 5/64" Allen wrench. Before assembly, a light application of vacuum grease on the gasket is recommended.