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Sight glass, Sight Gauge, Oil level sight glass, liquid Sight Glass, Oil level indicator, View port, male thread sight window
Material
Body:   Aluminum, Steel and Brass
O-Ring: Viton and NBR
Glass:  Real Glass
Glass Thickness: 2mm to 5 mm
Glass Type: General Glass, Tempered Glass and Borosilicate Glass 
Resist Temperature Range: -30 Cent degrees to 120 Cent degrees.

Size:
M10X1,M12X1.5,M14X1.5,M16X1.5,M20X1.5,M24X1.5,M27X1.5,M42X2,
G 3/8,G 1/2,G 3/4,G 1    NPT 3/8, NPT 1/2,NPT 3/4,NPT 1
Usage:  Pump Gearboxes, Speed Reducer, Compressor and Power Transmission.

More information, please feel free to contact me: grandmfgcn at yahoo dot com