Milton high quality dry gages for reliable service with compressors, filters regulators, air lines, pneumatic tools and equipment. Maximum working pressure: Should be limited to 75% of dial range. Maximum working temperature: 13 F. to 120 F. P.S.I. range 0 to 160, 1 1 2'' face. No. 1189: 1 8'' mini center back No. 1191: 1 4'' NPT mini gage No. 1194: 1 4'' NPT gage bottom mount