These Threaded Sight Glass Tubes are manufactured from Impact Resistant Polycarbonate. They are installed in-line and allows for the view of what's flowing in a application at all times. They are sold separately and can simply be screwed in-line.
They are also sold as an In-line Camlock Sight Glass & Strainer Assembly which allows for quick and easy connection to a hose assembly using Cam & Groove Couplings. The benefit of this Sight Glass Assembly is the ability to see and filter the flow at the same time.
A varierty of different Clear Sight Glass Nipples options are available including the light weight version, the standard version and the Inline Camlock Sight Glass and Strainer Assembly.