Baker Instruments LF Series LF45-30HG-1/4 Pressure Gauge, 30 to 0" Hg Vacuum, 4.5" Dial, 0.5% Accuracy, 1/4" NPT Bottom Mount, Sillicone Filled 4.5" diameter dial pressure gauge Stainless steel 316 wetted parts for corrosion resistance Display accuracy is + or - 0.5% over the entire range of the gauge (ASME B40.100 Grade 2A) Lower mount male NPT connection Silicone filled