... Gauge (Manometer) with Stainless Steel Bezel and Stainless Steel Roll Ring Liquid Filled GaugeCase sizes: 1.5, 2, 2.5, 3, 4 ... 6 inches Case material: stainless steel case, it can take with front flange, back flange Bezel material: stainless steel bezel, stainless ... ring Tube and socket: phosphor bronze and brass Movement: brass Liquid: glycerin or silicone oil Connection: 1/8, 1/4, 3 ...