... 4Z2are high quality dry gauges design to provide reliableservice on applications not corrosive to the typical applications include ... bezel, steelroll ring (or bayonet threaded ring), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS ... bezel, steelroll ring (or bayonet threaded ring), type: snap on, roll ringTUBE&SOCKET: steel with nickel plated, phosphor bronze ,SS ...