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Oil level Sight glasses, sight gauge, sight gage, oil level indicator, liquid sight glass, sight window, view ports, male thread sight glasses
Material
Body:   Aluminum, Steel, PPMA, PC 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.

Pressure Range:  5-10 Bar or 0.5MPa to 1 MPa.

Size:M10X1, M16X1.5,M20X1.5, ,M27X1.5,M33X1.5,
G 3/8,G 1/2,G 3/4,G 1    NPT 3/8, NPT 1/2,NPT 3/4,NPT 1