... Gauge 4Z2are high quality dry gauges design to provide reliableservice on applications not corrosive to the typical applications include pumps, ... /4", 1/2", 3/8", NPT, BSP or BSPT dependent on model & size. Bottom, backleft & right side connectionAVAILABLE RANGES:30Hg "- 0- ... /4", 1/2", 3/8", NPT, BSP or BSPT dependent on model & size. Bottom, backleft & right side connectionAVAILABLE RANGES:30Hg "- 0- ...