Oil filled pressure gauge description: 1. Indication range: 0~20, 670bar 2. Case nominal diameter: 1 1/2"; 2"; 2 1/2"; 3"; 4"; 5"; 6" 3. Case material: mild steel; stainless steel 4. Movement: brass; stainless steel 5. Connection: bottom connection, center back male connection 6. Inlet thread: 1/2", 1/4", 1/8", 3/8", bsp, bspt, npt 7. Filled oil: glycerine, silicone oil 8. Scales: psi, bar, mpa, kpa, kg/cm2, hg single or dual scale -