The necked mirror is one of the main accessories of industrial equipment. In the containers of petroleum, chemical, pharmaceutical, food and other industrial production devices, the mirror can observe the flow and reaction of liquid, gas, steam and other media in the container at any time, and play the role of monitoring production and avoiding accidents in the production process.
　　Main technical parameters:
　　Shell material: carbon steel WCB, stainless steel 304, 321, 316, 316L, steel lining Teflon.
　　Windows material: tempered borosilicate glass, quartz glass.
　　Sealing material: NBR, PTFE.
　　Working Pressure (MPa): <0.6
　　Working temperature (?): 0 ~ 200 (?)