PIC Gauge 201L-402CC 4" Dial, 30/0/30 psi Range, 1/2" Male NPT Connection Size, Bottom Mount Glycerine Filled Pressure Gauge with a Stainless Steel Case, Brass Internals, Stainless Steel Bezel, and Polycarbonate Lens Stainless Steel Case and Bezel Brass Internals and Connection (with built in snubber) Phosphor Bronze Bourdon Tube Liquid Filled Plastic Lens