1/2″ MPT Nickel Plate Steel Thread 750 PSI 300°F Fused Lens Sight Glass

High Pressure & Temperature Sight Glass: Withstands 750 psi and 300°F, ideal for refrigeration, compressor, and hydraulic system monitoring.

Fused Window Leak-Proof Design: Hermetically sealed fused sight glass eliminates leaks and prevents fogging for clear long-term viewing as a visual flow indicator.

Nickel Plated Corrosion Resistance: Nickel plate steel construction resists refrigerants, lubricants, and non-corrosive industrial fluids — a durable liquid level indicator for harsh environments.

Flexible Threaded Connections: Available in MPT sizes from 1/2″ to 2″ plus hard-to-find Rotolock option, compatible with various NPT threaded sight glass installations.

Quick Oil Level Inspection: Enables instant oil level sight glass checks and fluid condition monitoring without system disassembly, reducing downtime for gear box and compressor maintenance.

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Product Description

Designed for B2B industrial, HVAC, and refrigeration systems, this 1/2″ MPT Nickel Plate Steel Fused Lens Sight Glass delivers reliable, real-time visual monitoring of fluid conditions. The nickel-plated steel body provides robust corrosion resistance and durability, while the hermetically sealed fused lens ensures a clear, fog-free view and prevents leaks under pressure. Rated for 750 psi maximum working pressure and 300 °F (148 °C) maximum temperature, this sight glass is compatible with most refrigerants and non-corrosive industrial fluids, making it a versatile choice for critical system monitoring.
SpecificationDetail
Body MaterialNickel Plate Steel
Lens TypeHermetically Sealed Fused Lens
Connection OptionsMPT (1/2″, 3/4″, 1″, 1-1/4″, 2″) / 1-1/4″-12 UNF Rotolock
Max Working Pressure750 psi
Max Working Temperature300 °F (148 °C)
Compatible MediaMost refrigerants, non-corrosive industrial fluids
Thread Size (This Model)1/2″ MPT (Male Pipe Thread)
AdvantageDescription
High Pressure & Temperature RatingWithstands 750 psi and 300 °F, suitable for demanding HVAC, refrigeration, and industrial fluid systems.
Hermetically Sealed Fused LensThe lens is fused to the metal body, eliminating leak paths, preventing fogging, and ensuring long-term optical clarity under vibration and thermal cycling.
Versatile Connection OptionsAvailable in standard MPT sizes (1/2″ to 2″) plus the hard-to-find 1-1/4″-12 UNF Rotolock connection, accommodating diverse installation requirements.
Durable Nickel Plate SteelNickel-plated finish offers excellent corrosion resistance and surface hardness, protecting against refrigerants, lubricants, and industrial fluids.
Quick Visual InspectionEnables immediate fluid condition and level checks without system disassembly, reducing maintenance downtime and enhancing operational safety.
Application AreaSpecific Use
Refrigeration SystemsMonitor refrigerant liquid level and oil condition in compressors and chillers.
HVAC EquipmentProvide visual indication of fluid flow and level in heating and cooling circuits.
Industrial CompressorsCheck lubricant oil levels and detect moisture or contamination.
Hydraulic Power UnitsObserve hydraulic fluid condition and level in tanks and reservoirs.
General Industrial PipingServe as an inline sight glass for visual flow and fluid clarity inspection.

This sight glass is ideally suited for refrigeration compressors, HVAC systems, industrial chillers, hydraulic reservoirs, and lubricant lines — making it a preferred choice for refrigeration technicians, HVAC contractors, plant maintenance engineers, and OEM equipment manufacturers who require dependable visual monitoring in medium-pressure, moderate-temperature applications.

Body MaterialNickel Plate Steel
Lens TypeHermetically Sealed Fused Lens
Hermetically Sealed Fused LensMPT (1/2″, 3/4″, 1″, 1-1/4″, 2″) / 1-1/4″-12 UNF Rotolock
Max Working Pressure750 psi
Max Working Temperature300°F (148°C)
Compatible MediaMost refrigerants, non-corrosive industrial fluids

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
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  • 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

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