General Gauge 5J2 1)Dial: 1.5", 2", ... 8" 1/4" 1/2" 3)CE Certificate General Gauge 5J2 are high quality dry gauges design to ... pumps,compressors, pool filters as well as commercial and industrial equipments.CASE SIZES:1.5", 2", 2.5 ... ,compressors, pool filters as well as commercial and industrial equipments.CASE SIZES:1.5", 2", 2.5 ... ,restrictors, special connections and more. Steel Ring General Gauge 5J2