Quick Details
Place of Origin: Hebei, China (Mainland)
Brand Name: bright pearl
Model Number: OD50mm to 240mm
glass gauge: used in boiler
Specifications
Level Gauge Glass
Sight Glass 
materials:borosilicate glass 
thickness:17mm 
length:115~400mm
Level Gauge Glass
It’s made from Borosilicate, it is used in lever gauge in boiler for water position.
It is also named:  Reflex Gauge Glass, Sight glass, Reflex Glasses
Reflex sight glass, Spares For level Gauge
The category is as follows:
1) Three tendons (four grooves)
2) Two tendons (three grooves)
3) Plan transparent