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|---|---|
| Body Material | Carbon Steel |
| Body Finish | Electroless Nickel |
| Window Material | Glass |
| Window Type | Fused Window (Hermetically Sealed) |
| Window Diameter | 47/50 inch |
| Connection Type | NPT Pipe Threads |
| Thread Gender | Male |
| Thread Size | 1″-11 1/2 NPT |
| Pipe Size | 1 inch |
| Max Operating Pressure | 1250 psi |
| Max Operating Temperature | 500 °F (260 °C) |
| Advantage | Description |
|---|---|
| Extreme Condition Tolerance | Simultaneously rated for 1250 psi pressure and 500 °F temperature, making it ideal for high-pressure and high-temperature industrial applications. |
| Secure & Leak-Proof Connection | The 1″-11 1/2 NPT male thread ensures a tight, reliable pipe connection with excellent sealing performance and easy installation. |
| Durable Fused Window Design | The 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 Resistance | The electroless nickel plating on the carbon steel body offers excellent surface hardness and protection against lubricants, hydraulic fluids, and various chemical media. |
| Quick Visual Inspection | Enables real-time fluid level monitoring without system disassembly, significantly reducing routine maintenance time and improving operational efficiency. |
| Application | Purpose |
|---|---|
| Gear Boxes / Gear Reducers | Monitor gear oil levels to ensure adequate lubrication and prevent dry-running damage. |
| Hydraulic Tanks / Power Units | Provide real-time hydraulic fluid level visibility for stable system operation. |
| Compressors | Check lubricant levels to avoid overheating or wear due to insufficient oil. |
| Reservoirs / Lubricant Tanks | Serve as a dependable level indicator for daily inspections and oil management. |
| Industrial Pipelines | Act 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 / Standard | Description |
|---|---|
| NSF/ANSI 61 | Complies with health effects standards for drinking water system components. |
| CE | Meets EU safety, health, and environmental protection requirements. |
| ISO 9001 | Certified quality management system ensuring consistent production quality. |
| UPC | Complies with Uniform Plumbing Code standards. |
| Lead Free Compliant | Meets 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.
| Material | Carbon Steel (Body) |
| Body Finish | Electroless Nickel |
| Window Material | Glass |
| Window Feature | Fused Window |
| Window Diameter | 47/50 in |
| Connection Type | NPT Pipe Threads |
| Thread Gender | Male |
| Thread Size | 1″-11 1/2 |
| Pipe Size | 1 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.
Our Strengths
If you’re looking for an established, financially secure partner who offers robust quality systems, validated processes, continuous improvement strategies, and a proven track record, you’ve come to the right place. Contact us and we will show you the major breakthroughs OEMs have experienced with us
Our Double Window Sight Glass is a high-performance industrial sight glass designed for real-time liquid level inspection and flow visualization in industrial pipeline systems. Engineered with 16 bar maximum working pressure, this stainless steel sight glass delivers exceptional durability and reliability in high-pressure, corrosive working environments, making it the ideal solution for industrial fluid monitoring applications.
| Core Performance Feature | Detailed Specification |
|---|---|
| Max Working Pressure | 16 Bar (industrial grade high pressure resistance) |
| Nominal Size | 3/4 inch / 1inch, standard female thread connection |
| Main Body Material | 304/316 Stainless Steel, excellent structural strength |
| Glass Material | Tempered soda-lime glass, high light transmittance, clear observation |
| Seal Performance | PTFE gasket, leak-proof sealing, corrosion resistant |
| Working Temperature | -30°C ~ 130°C, short-term resistance up to 160°C |
| Core Advantage | High pressure resistant, corrosion resistant, easy to install, low maintenance |
| Applicable Industry | Working Condition Requirements | Selection Suggestion |
|---|---|---|
| Oil and Gas Industry | High pressure, oil medium, outdoor working conditions | Standard 16 bar stainless steel model, PTFE seal is fully compatible |
| Chemical Industry | Corrosive liquid, high temperature, pipeline transmission | 316 stainless steel model, better corrosion resistance |
| Pharmaceutical & Food Industry | Sanitary requirements, clean medium, low pressure | Standard model, food-grade PTFE seal, easy to clean |
| Water Treatment Industry | Water medium, normal temperature, pipeline observation | Standard model, cost-effective, stable performance |
At Fanovo, we are committed to providing high-quality industrial sight glass products that meet the highest industry standards. Every Double Window Sight Glass has passed strict factory tests to ensure that the pressure resistance, sealing performance and observation effect meet the design requirements. We provide professional pre-sales consultation and after-sales service, if you have any questions about product selection, installation or use, please feel free to contact us.
| Parameter | Specification |
|---|---|
| Product Model | GD100 Internal Thread Sight Glass |
| Core Keyword | Double Window Sight Glass |
| Nominal Width | DN25 – 1 Inch |
| Connection Type | Female Thread (ISO 7-1 / EN 10226-1) |
| Body Material | Stainless Steel 1.4408 (CF8M) |
| Glass Material | Tempered Soda-Lime Glass (DIN 8902) |
| Seal Material | PTFE Gasket |
| Face-to-Face Length | 120mm |
| Max. Operating Pressure | 16 Bar |
| Normal Working Temperature | -30°C ~ 130°C |
| Max. Short-Term Working Temperature | 160°C |
| Thermal Shock Resistance | 120°C (DIN 52323) |
| Key Features | High Pressure Resistant, Corrosion Resistant, High Temperature Resistant, Clear Visual Inspection, Leak-Proof Seal |
| Application Scenarios | Oil Level Inspection, Liquid Level Monitoring, Flow Visualization, Industrial Pipeline Sight Glass |
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.
Our Strengths
Design/Prototyping
Manufacturing & Assembly
Custom Labeling & Packaging
Inventory Management
Continuous Improvement & Refinement
If you’re looking for an established, financially secure partner who offers robust quality systems, validated processes, continuous improvement strategies, and a proven track record, you’ve come to the right place. Contact us and we will show you the major breakthroughs OEMs have experienced with us