Sight Glass Products
Nine product lines built around one core: the right glass, in the right housing, for your pressure, temperature and media.
TRI-CLAMP
Tri-Clamp Sight Glasses
Sanitary clamp connection, borosilicate to DIN 7080, USP Class VI — 1/2" to 12", up to 572°F and 230 psi FV. The standard for pharma, food and brewery lines.
View products →FLOW INDICATORS
Sight Flow Indicators
Inline visual flow verification with flapper, rotary, ball or drip-tube indication. Tri-clamp, threaded and flanged — up to 500°F and 300 psi.
View products →THREADED
Threaded Sight Glasses
Compact male NPT / BSP sight glasses for tanks and small-bore lines. Rated to 100 bar, 316 SS or Hastelloy bodies.
View products →FLANGED
Flanged Sight Glasses
Large-window flanged sight glasses for chemical, oil & gas and power piping. ANSI Class 150/300 or DIN PN10-PN40, quartz option to 1000°F+.
View products →BOLT-ON
Bolt-On Sight Glasses
Bolted cover-plate sight windows for storage tanks, mixers and reactors — 2" to 12" windows in 316 SS or carbon steel.
View products →WELD-IN
Weld-In Sight Glasses
Permanent butt-weld or socket-weld viewing windows for pressure vessels and steam duty. No gasketed joint to the vessel.
View products →HINGED
Hinged Sight Glasses
Quick-opening hinged sight windows for frequent cleaning and inspection — sanitary tri-clamp and industrial bolted versions.
View products →ACCESSORIES
Sight Glass Gaskets
Replacement gaskets in EPDM, silicone, Viton/FKM, PTFE and graphite-reinforced — matched to your model, media and temperature.
View products →ACCESSORIES
Replacement Windows
Glass-only replacement windows: borosilicate to DIN 7080, soda lime and fused quartz, cut to your housing dimensions.
View products →Product FAQs
Which sight glass connection should I choose?
Tri-clamp for sanitary and frequently dismantled lines, threaded for compact high-pressure duty, flanged for large pipes and high flow, weld-in for permanent installations.
Can you supply sight glasses with lights or wipers?
Yes — illuminated versions (24V LED) for dark process media, and wiper or spray versions for hazy or fouling applications.
Do you offer samples before bulk orders?
Standard sizes ship as samples (1-2 pcs) with a production order; custom items get a pre-production sample for approval.
Not Sure Which Sight Glass Fits?
Tell us your connection, media and pressure/temperature — we recommend the right model within 24 hours.