1″-11 1/2 NPT Male Carbon Steel 500 °F High Temperature 1250 PSI Fused Sight Glass for Gear Boxes/Reservoirs

Designed for heavy-duty industrial liquid level monitoring, the Fanovo fused sight glass is a reliable solution for gear boxes and reservoirs. It features a carbon steel body with an electroless nickel finish, delivering excellent durability and corrosion resistance to handle harsh B2B working conditions.
Equipped with a 1″-11 1/2 NPT male thread, this sight glass ensures a tight and secure pipe thread connection. Its 47/50 in diameter fused glass window allows clear visual inspection of clear liquids, enabling real-time fluid level monitoring without disassembly.
The product supports a maximum operating pressure of 1250 psi and a maximum operating temperature of 500 °F, making it suitable for high-pressure and high-temperature applications. It is engineered to provide stable and long-lasting performance for critical industrial fluid management tasks.
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This Fanovo fused sight glass is engineered for high-pressure and high-temperature liquid level monitoring in industrial gear boxes and reservoirs. Constructed with carbon steel body finished in electroless nickel, it delivers exceptional durability and corrosion resistance for demanding B2B applications.
Featuring a 1″-11 1/2 NPT male thread for secure pipe thread connection, and a fused glass window with 47/50 in diameter, this sight plug enables clear visual inspection of clear liquids. It supports a maximum operating pressure of 1250 psi and a maximum operating temperature of 500 °F, making it ideal for heavy-duty industrial environments. This sight glass ensures reliable performance for critical fluid level monitoring tasks.
SpecificationDetail
Body MaterialCarbon Steel
Body FinishElectroless Nickel
Window MaterialGlass
Window TypeFused Window (Hermetically Sealed)
Window Diameter47/50 inch
Connection TypeNPT Pipe Threads
Thread GenderMale
Thread Size1″-11 1/2 NPT
Pipe Size1 inch
Max Operating Pressure1250 psi
Max Operating Temperature500 °F (260 °C)
AdvantageDescription
Extreme Condition ToleranceSimultaneously rated for 1250 psi pressure and 500 °F temperature, making it ideal for high-pressure and high-temperature industrial applications.
Secure & Leak-Proof ConnectionThe 1″-11 1/2 NPT male thread ensures a tight, reliable pipe connection with excellent sealing performance and easy installation.
Durable Fused Window DesignThe glass window is fused directly to the metal body, providing enhanced structural strength, vibration resistance, and impact resistance compared to standard gasketed designs.
Superior Corrosion ResistanceThe electroless nickel plating on the carbon steel body offers excellent surface hardness and protection against lubricants, hydraulic fluids, and various chemical media.
Quick Visual InspectionEnables real-time fluid level monitoring without system disassembly, significantly reducing routine maintenance time and improving operational efficiency.
ApplicationPurpose
Gear Boxes / Gear ReducersMonitor gear oil levels to ensure adequate lubrication and prevent dry-running damage.
Hydraulic Tanks / Power UnitsProvide real-time hydraulic fluid level visibility for stable system operation.
CompressorsCheck lubricant levels to avoid overheating or wear due to insufficient oil.
Reservoirs / Lubricant TanksServe as a dependable level indicator for daily inspections and oil management.
Industrial PipelinesAct as an inline sight glass for observing fluid flow and condition.

This sight glass is widely used in gear boxes, compressors, hydraulic tanks, lubricant reservoirs, and industrial pipelines — making it an ideal choice for maintenance professionals, OEM manufacturers, and industrial engineering procurement teams who require reliable fluid level monitoring under tough working conditions.

Certification / StandardDescription
NSF/ANSI 61Complies with health effects standards for drinking water system components.
CEMeets EU safety, health, and environmental protection requirements.
ISO 9001Certified quality management system ensuring consistent production quality.
UPCComplies with Uniform Plumbing Code standards.
Lead Free CompliantMeets lead-free plumbing regulations.

Fanovo offers a one year warranty from the date of shipment. Should any workmanship or material defect appear within the warranty period, Fanovo will, upon verification and substantiation of proper installation and operation, correct such defects through repair or replacement at no charge.

For detailed specification sheets, custom design solutions, or volume purchase quotes, please contact our team today. Fanovo provides not only standard products but also comprehensive OEM/ODM services — from design and prototyping to manufacturing and distribution. Whether you need a custom finish, specialized thread, or unique configuration, we are ready to support your project from concept to delivery.

MaterialCarbon Steel (Body)
Body FinishElectroless Nickel
Window MaterialGlass
Window FeatureFused Window
Window Diameter47/50 in
Connection TypeNPT Pipe Threads
Thread GenderMale
Thread Size1″-11 1/2
Pipe Size1 in

Complies with Lead Free Plumbing Laws, NSF/ ANSI 61, UPC/ CE, ISO 9001

For approval information, please refer to the products specification sheet. For any other information on product certification and documentation information, please contact Fanovo.

FANOVO STATEMENT OF WARRANTY & LIMITATION OF WARRANTY

Fanovo warrants, to our all purchasers, that its products which are delivered to its purchasers will be the kind described in the order or price list and will be free of defects in workmanship or material for a period of two year from the date of shipping to you, our purchaser.

Should any failure to conform to this warranty appear within two year after the date of the initial delivery to our purchaser, Fanovo will, upon written notification thereof and substantiation that the goods have been stored, installed, maintained and operated in accordance with Fanovo’s recommendation and standard industry practice, correct such defects by suitable repair or replacement at Fanovo’s own expense. If any valve alleged to be defective, is reported to Fanovo headquarter in China, it will be examined and, if found to be defective under the warranty, it will be replaced at no charge in future order.

THIS WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OTHER WARRANTY OF QUALITY, WHETHER EXPRESS OR IMPLIED, EXCEPT THE WARRANTY OF TITLE AND AGAINST PATENT INFRINGEMENT Correction of non-conformities, in the manner and for the period of time provided above, shall constitute fulfillment of all liabilities of Fanovo to our purchaser, with respect to the goods, whether based on contract, negligence, strict tort or otherwise, it is the intention of Fanovo that no warranty of any kind, whether express or implied, shall pass through our purchaser to any other person or corporation.

LIMITATION OF LIABILITY: FANOVO SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE FOR SPECIAL OR CONSEQUENTIAL DAMAGES SUCH AS, BUT NOT LIMITED TO, DAMAGES OR LOSS OF OTHER PROPERTY OR EQUIPMENT, LOSS OF PROFITS, OR REVENUE, COST OF CAPITAL, COST OF PURCHASED OR REPLACEMENT GOODS, OR CLAIMS OF CUSTOMERS OF OUR INITIAL PURCHASER. THE REMEDIES OF OUR INITIAL PURCHASER, AND ALL OTHERS, SET FORTH HEREIN ARE EXCLUSIVE, AND THE LIABILITY OF FANOVO WITH RESPECT TO SAME SHALL NOT, EXCEPT AS EXPRESSLY PROVIDED HEREIN, EXCEED THE PRICE OF GOODS UPON WHICH SUCH LIABILITY IS BASED.

Fanovo is not just innovative products—we also provide wide-ranging capabilities, including design, manufacturing, and distribution. Each of these capabilities, as well as others, can be scaled to your needs – you can use as much or as little as makes sense for your product development.

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