The Series BTG Bulk Tanker Gages possess psi scales with 1% full scale ANSI B40.1 Grade 1A accuracy. The BTG gage is perfect for use on tanker trucks for monitoring discharge pressures while tank is being unloaded. The 4.5" BTG gages are designed with epoxy coated black steel housing that is rust and corrosion resistant. The BTG gages are designed with a silicone dampened counter weight attached tot he movement which allows the units to withstand vibration. Wetted parts include a brass socket and Phosphor Bronze Bourdon tube. Units can withstand temperatures of -40 to 160°F (-40 to 71°C). Units come with a 1/4" male NPT bottom connection.