These units are used in industry to visually check the fluid level within a reservoir or gearbox.
Vertical and angled oil level gauges are available in brass.
Screw in windows are available in various materials, the “drive-in” type is steel with plastic window.
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ADAMS Oil Levels and WindowsHylomar
Non-setting sealant
CPC
Miniature quick couplings
Hansen
Industrial quick couplings
Hansen FF
Industrial quick couplings