Boiler Sight Glass Assembly
Glass tube assembly with brass fittings for visually monitoring water levels in central heating boilers. Boiler-specific pressure rating. Classified under 8403.90.00.00.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If standalone glass tubes
Glass tubes without metal fittings are under glass articles.
If general valve parts
If only fittings without glass, classified as valve/accessory parts.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Specify borosilicate glass pressure rating; include blowdown valve if assembled; comply with boiler visibility standards
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