As a premier sight glass manufacturer and global fluid control supplier, Fanovo engineers high-visibility monitoring solutions for critical piping networks. Our heavy-duty brass sight glasses and moisture liquid indicators are designed to provide plant engineers and HVAC contractors with a crystal-clear, 360-degree visual inspection of fluid velocity, color, and phase changes without sacrificing system integrity.
Engineered for High-Pressure Resilience & Custom Metallurgy:
Extreme Pressure Capabilities: Built for critical industrial environments, our high-pressure sight glasses effortlessly handle working pressures up to 1500 PSI, or even higher, ensuring ultimate bursting protection.
Premium Material Options: Tailored to your specific fluid and chemical compatibility, our oil level sight glasses and liquid indicators are available in high-strength materials, including Aluminum, Brass, Stainless Steel 316L, and Monel 400.
Advanced Window Engineering: Equipped with scratch-resistant high-borosilicate glass, tempered windows, or high-durability sintered glass designed to survive extreme thermal shock, abrasive fluids, and harsh chemical environments.
Full OEM/ODM Engineering: Every dimension, thread type (NPT/BSPT), and housing material is 100% customizable. Backed by advanced CNC machining, we custom-manufacture tailor-made specialized flow indicator solutions straight from your blueprint drawings.
📥 Need robust, 1500+ PSI flow monitoring for your engineering project or wholesale inventory?
Brass Dome Sight Glasses & Flow Indicators
Engineered as our premier flagship product, Fanovo’s Brass Dome Sight Glass delivers unparalleled fluid monitoring performance for global industrial networks. Featuring a premium 3mm thick, ultra-clear dome window, this high-visibility indicator offers a panoramic, 360-degree view of your fluid dynamics, making it exceptionally easy to spot bubbles, flow rates, and phase changes instantly.
Machined from heavy-duty forged brass, our dome sight glasses are highly optimized for demanding coolant lines, refrigeration networks, and general commercial piping systems. Watch our demonstration video to see the crystal-clear transparency and heavy-walled durability that makes this our top-selling flow indicator worldwide
Our heavy-duty industrial sight glasses are engineered to safely operate in extreme environments, effortlessly handling standard working pressures up to 1500 PSI, or even higher depending on the customized housing and window thickness. Every high-pressure unit undergoes 100% rigorous pressure shell and hydraulic test verification at our manufacturing facility to guarantee absolute burst protection and leak-free security in critical pipeline networks.
Sintered glass windows offer a massive upgrade in thermal, mechanical, and chemical durability compared to standard glass. Through our advanced sintering manufacturing process, the glass is molecularly fused directly into the metal ring housing. This creates an incredibly robust, hermetic seal that exhibits supreme resistance to extreme thermal shocks, high-frequency pressure pulsations, abrasive fluids, and harsh chemical attack, drastically extending the system’s operational lifespan.
To perfectly match your specific media and fluid characteristics, Fanovo provides extensive custom metallurgy options. Beyond standard Aluminum and Forged Brass, our oil level sight glasses and visual indicators can be custom-machined from premium corrosion-resistant materials such as Stainless Steel 316L and Monel 400. These elite alloys are ideal for marine engineering, offshore applications, petro-chemical processing, and volatile industrial media.
Yes, as a fully-capable sight glass manufacturer, we provide comprehensive OEM/ODM customization services. We can precision-machine housing dimensions, customize connection types—including Threaded (NPT/BSPT/G), Flanged, or Solder/Sweat connections—and equip the interior with custom mechanical fluid indicators like rotors, flappers, or impellers to maximize low-flow visibility directly from your technical engineering blueprints.
Absolutely. Compliance and material traceability are foundational to our strict quality control. For all wholesale and custom industrial orders, we provide full Material Test Reports (MTRs) detailing the chemical composition and mechanical properties of the metals (Brass, 316L, Monel 400) and the glass (Sintered / Borosilicate). All products are manufactured to strictly align with global industrial standards to ensure a seamless engineering approval process for your supply chain.
We offer multiple high-performance sealing options tailored to your exact temperature, pressure, and chemical compatibility requirements. Our standard flow indicators utilize premium Viton (FKM) O-rings or Teflon (PTFE) gaskets, delivering exceptional resistance to petroleum products, solvents, refrigerants, and aggressive industrial chemicals.
For specialized or critical environments, we supply heavy-duty Metal Gaskets and Red Copper Washers/Gaskets. These metal-to-metal sealing solutions are engineered specifically for extreme high-pressure (1500+ PSI), ultra-high-temperature, or vacuum applications where elastomer seals might degrade or fail over time. Additionally, custom elastomer solutions like EPDM or NBR are available to ensure absolute zero-leakage security across all long-term industrial operations.
We pride ourselves on offering an agile, flexible, and commercial-grade B2B manufacturing supply chain. Our operations are strictly dedicated to B2B global distributors and OEMs—we do not cater to the retail market.
Accelerated Lead Times: While many competitors require months for exotic alloy runs, our standard custom production for Stainless Steel 316L or Monel 400 is typically compressed to just 2 to 3 weeks. Even if your unique specifications require completely new custom tooling or mold development, we can deliver within approximately 4 weeks.
Flexible, Growth-Oriented MOQs: We fully understand the risk-management protocols of modern procurement managers. To support our B2B partners, we gladly accept initial test or trial orders as low as 20 pieces. We view this low-MOQ entry point as a mutual investment to verify our precision quality, with the shared goal of building a long-term, high-volume manufacturing partnership.
Restoring the Lifeline: The Role of Advanced Flow Control in Disaster Recovery The news from Venezuela is deeply saddening. On behalf of the entire Fanovo team, our hearts go out to all the families a
What Is a Boiler Drain Valve Actually Used for on Your Molding Equipment? You need a quick mold change. The temperature control unit is full of hot, pressurized water, making the process slow and dang
How Do You Know if Your Mold’s Bypass Valve is Open or Closed? Your mold temperature is unstable, causing defects. You suspect a flow issue, but the chiller seems fine. Is a hidden valve sabotaging yo
Should Your Chiller’s Sight Glass Go Before or After the Filter-Drier? You’re desperately trying to fix a chiller that isn’t cooling your mold properly. The sight glass looks clear, but you still susp
How Does an Industrial Float Valve Keep Your Chiller Tank from Running Dry? The emergency alarm sounds. Production halts. The problem isn’t the mold or the machine, but an empty chiller tank that has
Do Your Mold Sight Glasses Really Need Special Maintenance? You installed them on every cooling line. Now you just glance at them, trusting the little spinners or floating balls. But are you ignoring
