Dwyer F7-HPS-21 is a horizontal/specialty level switch with an enclosure rating of general purpose. It has a temperature range of -4 to 257°F (-20 to 125°C) for F6-SS and F6-MHS models and 14 to 176°F (-10 to 80°C) for F6-HPS-11, 21, and 31 models. The switch has 22 AWG electrical connections and various mounting options. It is designed for use with compatible liquids and has a pressure limit of 218 psi for F6-SS and F6-MHS models, and 116 psi for F6-HPS-11, 21, and 31 models. The switch features a SPST hermetically sealed reed switch that is reversible for NO or NC operation. The specific gravity ranges from 0.6 to 0.85 depending on the model. The switch is equipped with an alnico or ceramic magnet and wire leads of various lengths.