NPT Sight Glass

NPT sight glasses are typical NPT fittings having NPT male threads, where the window is encased into the metal housing forming a single-piece part.

Designed up to 7000 psi pressure, these sight glasses have optical clarity suitable for imaging systems and also for looking at oil levels inside pressure vessels, or checking the color of a refrigerant. These NPT sight glasses transmit a broad spectrum of wavelengths, ranging from near-infrared, visible light, to ultraviolet.
Image Encole Part Number Price Aperture Dia. Max Operating Pressure Max Operating Temperature Housing Material Thread Window Material
265A1000 $244.95 each 0.380 inch AISI 316 3040 psi 140 C NPT 3/8" Quartz
265A1001 $255.78 each 0.460 inch AISI 316 3040 psi 140 C NPT 1/2" Quartz
265A1002 $259.80 each 0.640 inch AISI 316 3040 psi 140 C NPT 3/4" Quartz
265A1003 $275.99 each 0.860 inch AISI 316 3040 psi 140 C NPT 1" Quartz
265A1004 $368.87 each 1.180 inch AISI 316 3040 psi 140 C NPT 1-1/4" Quartz
265A1005 $409.00 each 1.380 inch AISI 316 3040 psi 140 C NPT 1-1/2" Quartz
265A1006 $498.16 each 1.800 inch AISI 316 2900 psi 140 C NPT 2" Quartz
324A1000 $308.36 each 0.360 inch AISI 316 7048 psi 140 C NPT 3/8" Quartz
324A1001 $326.04 each 0.410 inch AISI 316 7048 psi 140 C NPT 1/2" Quartz
324A1002 $341.93 each 0.570 inch AISI 316 7048 psi 140 C NPT 3/4" Quartz
324A1003 $354.68 each 0.750 inch AISI 316 7048 psi 140 C NPT 1" Quartz
324A1004 $479.00 each 1.050 inch AISI 316 7048 psi 140 C NPT 1-1/4" Quartz
324A1005 $597.58 each 1.250 inch AISI 316 7048 psi 140 C NPT 1-1/2" Quartz
324A1006 $662.42 each 1.680 inch AISI 316 7048 psi 140 C NPT 2" Quartz
405S05 $181.27 each 9.00 mm 2205 Duplex 100 bar 280 C NPT 1/4" Borosilicate
405S06 $189.55 each 10.00 mm 2205 Duplex 100 bar 280 C NPT 3/8" Borosilicate
405S07 $198.32 each 14.00 mm 2205 Duplex 100 bar 280 C NPT 1/2" Borosilicate
405S09 $209.24 each 18.00 mm 2205 Duplex 100 bar 280 C NPT 3/4" Borosilicate
405S11 $218.53 each 22.00 mm 2205 Duplex 100 bar 280 C NPT 1" Borosilicate
405S12 $288.89 each 25.00 mm 2205 Duplex 100 bar 280 C NPT 1-1/4" Borosilicate