This document provides information about polycarbonate protective covers from STI that protect large devices from physical damage, dirt, and severe environments. It describes the key features of the STI-7500H, STI-7500V, STI-7501H and STI-7501V mini mega stopper covers, as well as the larger STI-7600 mega stopper cover. The polycarbonate material is tough, weather-resistant from -40 to 250 degrees Fahrenheit, and the covers are backed by a three year warranty against breakage during normal use. Dimensions and installation details are provided for the different models.