... .5", 2", 2.5", 3", 3.5", 4", 6" 2)Connection size: 1/8" 1/4" 1/2" 3)CE Certificate ... Gauge 4Z2are high quality dry gauges design to provide reliableservice on applications not corrosive to the typical applications include pumps,compressors, pool ... more. are high quality dry gauges design to provide reliableservice on applications not corrosive to the typical applications include pumps,compressors, pool ...