The sight tube of the 5700 Series Level Gauge is completely protected.  Three sides of the gauge are protected with a metal frame, while the face of the gauge is protected with a polycarbonate shield.  This shield can be custom calibrated to read tank volume or any other calibration.  Refer to the Product Specifications tab to see the assortment of standard shield options.  For mounting purposes, a mounting lug is welded to the back of the gauge.  The standard sight tube is glass; other sight tube materials are available, along with a wide option of O-ring seals.  The gauge is fitted with 1/2″ MNPT x 3/8″ FNPT connections.