Stainless steel case Brass internal Glycerin filled Back connection Good quality Liquid filled Pressure Gauge:Case sizes: 1. ... material: stainless steel case, it can take with front flange, back flange and U-clamp Bezel material: stainless steel bezel, stainless ... ", BSP, NPT or BSPT dependent on model and size; bottom, back, left and right side connection Available ranges: vacuum and compound ...