... , Dry gauge, to test the pressure of pipes, valve, and machine, with comperetive price. Stainless Steel Dry Pressure Gauge,1. Dial Size: 4" (100mm ... )3. Connection: Lower Back (Horizontal)4. Connection Size: 1/4", 1/2" NPT, BSP, Customer-made is available5. Case Material: Stainless steel 304 / 316 ...