4″ and 6″ Stainless steel pressure gauges front flange and bottom connection all stainless 316 corrosion resistant exterior and interior (case, mechanism, tube and process connection) with glycerine filled for low, medium and high pressure up to 0-60000 Psi (Accuracy 1 %). Ideal for applications including chemical processing, oil field & offshore, paper mills, agriculture plants, marine and water & wastewater. 4″ Inch dial with 1/4 Male NPT and 1/4″ Female HP.