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Standard Steel Liquid Level Gages can be used on hydraulic reservoirs, gearboxes, bearing housings, crankcases, transformers and machinery oil reservoirs.  Their use can be extended to any industrial liquid level viewing application.  Fluid enters through the cross hole in the hollow lower bolt and the gage is vented into the tank through the cross hole in the top bolt.   The length between the center of the two bolts is referred to as the centerline.  Centerlines are available from 3" to 60". 
B1559 Category
Items B1559-1X58
B1559-10300VA1W
(Formerly B1559-1-S01X71), Standard Steel Liquid Level Gage, 3” Centerline, Front Mount 1/2"-20
B1556-1X39
B1559-10300VB1W
Standard Steel Liquid Level Gage, 3” Centerline, Back Mount 1/2”-20 with Nuts
B1559-1-S04X03
B1559-10300VA2W
Standard Steel Liquid Level Gage, 3” Centerline, Front Mount 1/2"-13
B1559-1X58
B1559-10300VM1W
Standard Steel Liquid Level Gage, 3” Centerline, Front Mount M12 X 1.75
B1559-1X72
B1559-10400VA1W
Standard Steel Liquid Level Gage, 4” Centerline, Front Mount 1/2"-20
Centerline N/A 3" N/A 3" N/A 3" N/A 3" N/A 4"
Mounting N/A 1/2"-20 N/A 1/2"-20 with Nuts N/A 1/2"-13 N/A M12 X 1.75 N/A 1/2"-20
Feature N/A Standard
Max Pressure N/A 125 PSI
Max Temperature N/A 300° F
Seals N/A Viton
Body Material N/A Plated Steel