Our circular sight glass lenses are available in virtually any material, thickness and configuration, and we maintain a large stock of lenses ready to ship. Annular edge sight glasses come in standard sizes, and all other sight glasses can be quoted by filling out our quote request form
. Sight glass pressure ratings for custom lenses depend on the viewing diameter of the mounting sight window unit. If you are looking for complete sight window units with mounting flange connections, click on one of the links to the left.