Low Cost Sight Glass

Low cost sight glasses are typically used for a quick visual inspection of oil levels or refrigerant color. These sights may have windows slightly opaque or not perfectly flat and polished, but should be good enough to transmit light and see the basic shapes behind the glass. Low cost sight glasses are produced in large quantities in order to take advantage of volume manufacturing. These sights are robust and simple to install. These inexpensive sight glasses are designed for a sweet-spot of most common operating parameters, where the pressures do not exceed 300 psi with temperatures below 130 degrees C, (57 F).

Oil-Rite Corporation

Low Cost Fused NPT-Threaded Sight Glasses, Zinc-Plated Carbon Steel, Sodalime

Sodalime glass is fused to a plain carbon steel body which is Zinc-plated for added corrosion resistance. These sight glasses can be threaded directly into a pipe, or a boss welded to a pipe with subsequent threads cut into the boss. These are ideal budget sight glasses/viewports for visual observation of liquid levels and their colors. Applications include hydraulic systems with mineral oils, diesel, and other common petrochemicals where low cost is required. Not suitable for cycling high temperature, high pressure or aggressively corrosive applications.

Aperture Dia.ThreadHousing MaterialWindow MaterialMax Operating PressureMax Operating Temp.With ReflectorMfg. P/N.Encole P/N.Price
0.340 inchNPT 1/4"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-1OR110001$6.62each
0.560 inchNPT 1/2"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-3OR110003$7.46each
0.940 inchNPT 1"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-5OR110005$12.26each
1.190 inchNPT 1-1/4"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-6OR110006$21.91each
1.440 inchNPT 1-1/2"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-7OR110007$25.98each
1.880 inchNPT 2"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-8OR110008$31.49each
0.440 inchNPTF 3/8"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-2OR110002$6.79each
0.750 inchNPTF 3/4"Carbon Steel, PlatedSoda lime125 psi130 FNoA2890-4OR110004$9.57each
Oil-Rite Corporation

Stainless Steel Gasketed Glass Sights with NPT Threads

303 Stainless Steel Gasketed Glass Sight for visual observation of liquid levels and their condition. This sight glass is typically used in any application where oil or fluid inspection is essential. The housing is a 303 Stainless Steel fitting with U.S. standard NPT threads conforming to ASME B1.20.1. Use traditional installation tools and Teflon tape or pipe sealant. These sights have Buna-N internal seal with good chemical compatibility with Petroleum oils and fluids; Cold Water; Silicone greases and oils; Dibasic Acid Ester (Diester) based lubricants (MIL-L-7808); Ethylene glycol base fluids (Hydrolubes). Not Recommended for: Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene); Nitro hydrocarbons (nitrobenzene, aniline); Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul); Ketones (MEK, acetone); Strong Acids Ozone; Automotive brake fluid.

Aperture Dia.ThreadHousing MaterialWindow MaterialMax Operating PressureMax Operating Temp.With ReflectorMfg. P/N.Encole P/N.Price
0.312 inchNPT 1/4"AISI 303Soda lime125 psi225 FNoB4763-01B330A1000$59.26per package of 2
0.469 inchNPT 3/8"AISI 303Soda lime125 psi225 FNoB4763-02B330A1001$65.32per package of 2
0.594 inchNPT 1/2"AISI 303Soda lime125 psi225 FNoB4763-03B330A1003$77.32per package of 2
0.781 inchNPT 3/4"AISI 303Soda lime125 psi225 FNoB4763-04B330A1005$85.32per package of 2
1.000 inchNPT 1"AISI 303Soda lime100 psi225 FNoB4763-05B330A1007$93.78per package of 2
1.593 inchNPT 1-1/4"AISI 303Soda lime75 psi225 FNoB4763-06B330A1009$123.70per package of 2
1.531 inchNPT 1-1/2"AISI 303Soda lime50 psi225 FNoB4763-07B330A1011$72.67each
1.969 inchNPT 2"AISI 303Soda lime50 psi225 FNoB4763-08B330A1013$86.75each
Oil-Rite Corporation

Stainless Steel Gasketed Glass Sights with Reflector, NPT Threads

Reflector behind the glass helps see oil levels, presence of liquids, color, quality of a fluid. 303 Stainless Steel Gasketed Glass Sight for visual observation of liquid levels and their condition. These sight glasses are typically used in any application where oil or fluid inspection is essential. The housing is a 303 Stainless Steel fitting with U.S. standard NPT threads conforming to ASME B1.20.1. Use traditional installation tools and Teflon tape or pipe sealant. These sight glasses have a Buna-N internal seal for good chemical compatibility with Petroleum oils and fluids; Cold Water; Silicone greases and oils; Dibasic Acid Ester (Diester) based lubricants (MIL-L-7808); Ethylene glycol base fluids (Hydrolubes). Not Recommended for: Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene); Nitro hydrocarbons (nitrobenzene, aniline); Phosphate ester hydraulic fluids (Skydrol, Fyrquel, Pydraul); Ketones (MEK, acetone); Strong Acids Ozone; Automotive brake fluid.

Aperture Dia.ThreadHousing MaterialWindow MaterialMax Operating PressureMax Operating Temp.With ReflectorMfg. P/N.Encole P/N.Price
0.469 inchNPT 3/8"AISI 303Soda lime125 psi225 FYesB4763-12B330A1002$71.32per package of 2
0.594 inchNPT 1/2"AISI 303Soda lime125 psi225 FYesB4763-13B330A1004$81.32per package of 2
0.781 inchNPT 3/4"AISI 303Soda lime125 psi225 FYesB4763-14B330A1006$93.32per package of 2
1.000 inchNPT 1"AISI 303Soda lime100 psi225 FYesB4763-15B330A1008$95.32per package of 2
1.593 inchNPT 1-1/4"AISI 303Soda lime75 psi225 FYesB4763-16B330A1010$64.67each
1.531 inchNPT 1-1/2"AISI 303Soda lime50 psi225 FYesB4763-17B330A1012$74.85each
1.969 inchNPT 2"AISI 303Soda lime50 psi225 FYesB4763-18B330A1014$89.65each

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