Product features：
Sanitary Union Welding Sight Glass: Used on liquid pipelines such as backflow before draining or receiving tank, cooling water, etc. to observe the liquid flow.
Body material: 304, 316, 316L, 321, etc.
Nominal pressure range: 2.5 and 6 kg/cm2.
Working temperature: metal ≤ 200 ℃, the allowable abrupt change temperature 80 ℃ Nominal diameter:
DN25~DN100 sight glass is made of tempered borosilicate glass, and the chromatic temperature difference of tempered borosilicate glass is 180℃.