Tri Clamp Caged Sight Glass
These tri clamp sight glasses are available in multiple sizes. They feature a cylindrical glass viewing area that acts as a tube between the metal tri calmp connectors. Four bolts hold the assembly together, with gaskets keeping the glass and stainless parts fitting tightly.
These types of sigh glasses are best for high pressure applications because of the steel caging around the glass. This adds pressure resistance and protects from glass fragments.