A clear sight glass is the most economical and easiest way to add clarity to your piping systems. With an in-line sight gauge you can easily monitor your fluid transfers. Often you need to monitor the color or consistency of your materials during the fluid transfer process. Or, perhaps you need to verify flow. Regardless of your need for visually inspecting your fluid transfers, a standard socket (slip / weld) in-line sight glass allows you to retrofit any standard IPS sized PVC system. The socket union ends allow you to remove and replace the sight glass as needed.