4500psi Pressure Guage(shows output 0 - 3000psi) 5000psi Pressure Gaugeshows cylinder pressure Uses: fire breathing apparatus air bottle, scuba breathing apparatus air bottle, constant pressure valve, high pressure pump, can also be equipped in fire, medical-rescue, rescue and other vehicles, in the fire, coal mine and chemical accidents and other disaster accident scene. Note:The dust cover has no actual function and the color is random,and cannot be specified. Output thread:G1/2-14 Input thread:M18x1.5 Colour:Black Material:Metal Package Contents: 2 * Pressure Regulator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.