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VACUUM MANOMETER (PRESSURE INDICATORS); PRESSURE RANGE: 0-250 B AR; THREAD DIAMETER: 1/4 " NPT; CASE DIAMETER: 2-1/2 M; CONNECTION TYPE: BACK LOWER; 304 STAINLESS STEEL CASE SEALED BEZEL; BOURDON, PHOSPHOR BRONZE; FILLED WITH GLYCERINE, MOVEMENT, MATERIAL BRASS CONNECTION AND RESTRICTOR