FSG043: 2″ NPT Carbon Steel High Pressure Peep Sight & Bulls Eye Sight Glass

Model & Core Spec: FSG043 | 2″ NPT Carbon Steel High Pressure Peep Sight with Tempered Glass Bulls Eye.

Heavy-Duty Construction: Zinc-plated carbon steel body paired with a heavy-duty tempered glass lens and secure gasket, engineered for maximum durability and corrosion resistance.

High-Pressure Performance: Safely handles a maximum operating pressure of 3000 PSI (207 bar), ideal for demanding industrial applications.

Easy Maintenance: Designed for quick and easy removal of the lens and gasket for routine cleaning or replacement.

Custom Solutions: Full customization available at FANOVO for specialized working environments, thread standards (NPT/BSP), and auxiliary components (baffle or ball).

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High Pressure Bulls Eye Sight Glass

 

Part NumberCABView Area
FSG0381/2″ NPT1-1/4″1-15/32″1/2″
FSG0393/4″ NPT1-1/2″1-1/2″3/4″
FSG0401″ NPT1-3/4″1-5/16″1″
FSG0411-1/4″ NPT2″1-23/32″1-1/4″
FSG0421-1/2″ NPT2-3/4″1-23/32″1-1/2″
FSG0432″ NPT2-3/4″1-3/4″2″

 

Overview

Our high-pressure threaded peep sight glass provide direct, reliable visual observation of fluid processes within industrial pipes, tanks, gear cases, bearing housings, and pressure vessels. Engineered to replace standard low-margin fittings, our custom sight glasses offer exceptional safety margins and long-term durability in demanding environments.

Proprietary 40-Year Tempered Glass Technology

Unlike standard off-the-shelf fittings, our sight glass lenses are custom-manufactured in our dedicated glass factory with a 40-year legacy. This vertical integration gives us unmatched expertise in advanced glass engineering:

Explosion-Proof & High-Pressure Resilience: Custom-engineered to withstand extreme mechanical stress, safely supporting operating pressures of 3000 PSI (207 bar) and above.

Superior High-Temperature Resistance: Specially treated for excellent thermal shock and high-temperature endurance in harsh industrial cycles.

Uncompromising Safety: Every lens undergoes rigorous strength and pressure testing to ensure maximum structural integrity and operator safety.

Custom Material Options: Carbon Steel & Stainless Steel

We manufacture custom sight glasses tailored to your precise operating conditions, with primary material options including:

Carbon Steel: Highly robust and rigid, treated with advanced zinc plating or specialized protective coatings for maximum structural strength.

Stainless Steel (304 / 316): Provides superior corrosion resistance, making it ideal for aggressive chemical, marine, and high-purity applications.

How to Choose Internal Flow Indicators

An internal indicator provides visual confirmation of fluid movement from a distance, especially recommended for dark or high-flow liquids:

Flapper Indicator: Offers a subtle, reliable indication of standard flow.

Ball Indicator: Moves more prominently than a flapper for easier viewing at a distance.

Rotor Indicator: The most obvious visual cue for maximum visibility in active systems.

Back Window: Can be backlit to dramatically increase visibility when monitoring dark or opaque liquids.

Everything You Should Know About Peep Sight Custom Manufactured by Fanovo

 

  • Material Body: Stainless Steel or Carbon Steel Nickle Plated
  • O-Ring: Viton, FKM, NBR, Aramid gasket and Copper seal
  • Glass Thickness: 2mm to 5 mm
  • Glass Type: Natural Glass, Tempered Glass and Borosilicate Glass
  • Resist Tempreature Range: -30’C to 120’C
  • Thread type: NPT, NPTF, UNC, UNF, Metric and BSP(G thread)
  • Size: Below you will get the size you wanted. OEM are welcome
  • Usage: Pump, Oil Receivers, Gearboxes, Speed Reducer, Compressor and Power Transimission

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.

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