... , Competitive Price, OEM Service; Pressure Gauge:1. Type: Liquid filled pressure gauges2. Case sizes: 1.5'', 2'', 2.5'', 3'', 4'' ... brass5. Liquid Filling: With or without liquid, glycerine., silicone oil6. Connection: 1/8, 1/4, 3/8, 1/2, inches BSP ...