... gas pressure gauge 1 Case with rolling 2 Dial: 1.5" 2", 2.5", 3", 3.5", 4", 6" 3 Connection ... size: 1/8" 1/4" 3/8 1/2 gas pressure gauge1) Case: ... steel with bronze plate2) Dial: 1.5", 2", 2.5", 3", 3.5", 4", 6"3) Connection ... ) Bourdon tube: brass, phosphor bronze, stainless steelc) Connection: brass, stainless steeld) Dial and pointer: aluminume) Window ...