The Sight Glass

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Luneta’s new Sight Glass has all the clarity and durability you need, with none of the leaks, cracks or squinting you may be used to with those old-style oil sight glasses. You’ll never have to use fragile, dark, hard-to-read oil sight glasses again!


Thread Size NPT BSPP
1.0″ Available Available
0.25″ Available Available
0.375″ Available Available
0.5″ Available Available
0.75″ Available Available
1.25″ Available N/A
1.5″ Available N/A


Thread Size Metric
M10x1.0 Available
M10x1.5 Available
M12x1.5 Available
M16x1.5 Available
M20x1.5 Available
M22x1.5 Available


Comparison Luneta Sight Glass Acrylic Sight Glass
Impact Resistance (Joules) >40 8.9
Toughness or Durability (Notched Izod, 23-deg C, J/cm) 9.8 0.2
Wall Thickness (Thinner = Clearer) 0.19″ 0.25″
Chemical Resistance Excellent Poor


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