CrowCrowCrow
CrowCrowCrow
Search products...
My Orders
Gold
Cart
  • Clearance
  • Exclusive
  • China Market
  • Coins
  • Brands

Looking for an imported product?

We can arrange it. Send the name or a store link on WhatsApp — we'll check if we can source it and quote the all-in India price.

WhatsApp Us
CrowCrowCrow

Free Shipping

Standard delivery, all India

Secure Packaging

Factory-sealed, damage-safe

About

  • About CrowCrowCrow
  • How It Works
  • Careers
  • Press & Media
  • Sustainability
  • Blog & Guides
  • Why Choose CrowCrowCrow

Buyer Help

  • Contact Us
  • Track Order
  • Customs & Duties
  • Size Guide
  • Payment Options
  • FAQs
  • Buyer Protection

Our Policies

  • Privacy Policy
  • Shipping Policy
  • Terms and Condition
  • Return and Refunds Policy
  • Cancellation Policy

Programs & B2B

  • Clearance Sale
  • Rewards ProgramSoon
  • Refer a FriendSoon
  • Student DiscountSoon
  • Affiliate ProgramSoon
  • CCC Membership
  • Wholesale & B2B
  • Corporate Gifting
  • Free Tools
  • Price Match

Connect With Us

Payment Methods

Visa
Mastercard
RuPay
Amex
UPI
Google Pay
PhonePe
Paytm

Shipping Partners

BluedartDelhiveryExpressBoxIndia Post
Cookie Policy··Disclaimer·DMCA·MCP for AI·Authenticity·Money-Back·Security

© 2026 Color Papers India Private Limited

Color Papers India Private Limited · 2nd Floor, Flat No. 2A, Vrindavan Building, MIDC Road, Opp. Saraswati Tower, Mira Road East, Mira Bhayandar, Thane, Maharashtra 401107, India · connect@crowcrowcrow.com

Help us give you a better experience. We use cookies to remember your cart, speed up checkout, and show you authentic US products worth importing. You stay in control — your data is handled per India's DPDP Act 2023. Cookie Policy

Air-Compressor Accessories
  1. Home
  2. Tools & Home Improvement
  3. Power & Hand Tools
  4. Power Tool Parts & Accessories
  5. Air Tool Parts & Accessories
  6. Air-Compressor Accessories
  7. Boltigen 1'' NPT…
Boltigen

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks - main product image
All-inclusive price — duties & taxes paid, no customs charges at delivery
₹4,230₹5,750

You save ₹1,520 (26%)

26% off the seller list price

Qty
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks — Silver
Silver
₹3,830
₹5,050
In Stock
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks — 1 inch
1 inch
₹4,230
₹5,750
In Stock
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks — 1/2 inch
1/2 inch
₹3,420
₹5,100
In Stock
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks — 2'' NPT
2'' NPT
₹5,640
₹7,590
In Stock

Estimated doorstep delivery by 9 Nov - 11 Nov from USA

Add on Google

Tested and Trusted · Always Original & 100% Imported

View trust tables•Know about trust badges
Sourced from US retailers
Sourced from US retailers
Factory-Sealed
Factory-Sealed
All Duties Included
All Duties Included
GST Invoice Issued
GST Invoice Issued
ExpressBox Tracked
ExpressBox Tracked
Secure Payments
14-Day Smile Guarantee
14-Day Smile Guarantee

Ensure Equipment Health with Clear Oil Monitoring

About this item

Boltigen 1'' NPT Stainless Steel Oil Sight Glass offers a robust solution for monitoring fluid levels in industrial equipment. Imported from authorized US retailers, this gauge provides a clear, reliable view of oil color, clarity, and potential water contamination, ensuring optimal performance for your air compressors, gearboxes, and hydraulic tanks. It's designed for easy installation and long service life in demanding environments.

Constructed from solid stainless steel 304 with a tempered borosilicate glass window and an NBR o-ring, this sight glass is built to withstand pressures up to 800 PSI (55 bar) and temperatures ranging from -30°C to 120°C (-22°F to 248°F). The integrated baffle and red ball enhance visibility, making it simple to observe medium changes and perform visual inspections of water, oil, and gas (WOG).

For Indian buyers, this imported sight glass offers superior material quality compared to many local alternatives, ensuring durability and leak-free operation. All customs duties and GST are pre-paid and included in the listed INR price. Your order is shipped via ExpressBox with tracking, providing transparency from dispatch to delivery.

Key Features

  • Temperature & Pressure — 1'' NPT stainless steel oil sight glass gauge can work under pressure 800 PSI (55 bar) and temperature -30-120C(-22-248F). The sight window is qualified to pass strict pressure and temperature tests by our factory.
  • Good Transparet View — The stainless steel oil level sight glass with tempered glass, can provide you with a good transparent sight view , the compressor oil sight glass is also with baffle and red ball which help you can easily observe the change of medium.
  • Material — The hydraulic tank sight glass is made of solid stainless steel 304, The glass is borosilicate glass, The o-ring inside the oil sight glass is NBR , which is not easy to wear and burst compares to plastic material. It can work in different environment.
  • Application — The stainless steel oil sight plug is a kind of liquid indicator used in tanks, air compressors, pumps, piping system, automotive industries, lab equipments, bearing housing and mixers etc. The oil level indicator has good viewport for visual Inspection of water, oil and gas (WOG).
  • Service — Our QC department do 100% quality inspection on the stainless steel sight glass before delivery. We will do 100% refund if the sight plug part is defective. Your valuable suggestions and advice will be greatly appreciated by our team.

Why choose this product

Engineered for Industrial Demands

This Boltigen oil sight glass is engineered for critical fluid monitoring in industrial machinery. Its robust construction from 304 stainless steel and tempered borosilicate glass ensures it can handle extreme pressures up to 800 PSI and temperatures from -30°C to 120°C. Unlike standard plastic indicators, it resists wear and bursting, providing a clear, reliable view of oil condition and potential contamination. This means fewer unexpected breakdowns and more consistent equipment performance, crucial for maintaining operational efficiency in Indian manufacturing and workshops.

Ideal for High-Pressure Systems, Skip if NPT Thread is Not Compatible

This sight glass is perfect for air compressors, hydraulic tanks, pumps, and gearboxes that operate under high pressure and temperature. Its clear view aids in early detection of oil degradation or water contamination. However, it uses a 1'' NPT male thread. If your equipment uses a different thread standard like BSP, you will need to purchase a compatible thread adapter separately to ensure a proper seal and prevent leaks. Always verify your existing thread size before purchasing.

How to use

  • Verify Thread Compatibility — Confirm your equipment uses a 1'' NPT female port. If it uses BSP or another standard, acquire a suitable NPT to BSP adapter before proceeding.
  • Prepare the Port — Clean the 1'' NPT female port on your tank, compressor, or gearbox. Apply a small amount of thread sealant (like PTFE tape or pipe dope) to the male threads of the sight glass for a secure, leak-free seal.
  • Install the Sight Glass — Carefully screw the 1'' NPT male threads of the Boltigen sight glass into the prepared port. Hand-tighten first, then use a wrench on the hex head to snug it securely, avoiding over-tightening which can damage the threads or the unit.
  • Monitor Oil Levels — Observe the oil level through the tempered glass window. The integrated baffle and red ball help you easily see the medium's status, checking for clarity, color, and any signs of water or contamination.

Example scenarios

Typical situations where Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks helps — illustrative scenarios, not customer reviews.

1
Scenario 1
Illustrative example
Where it helps

An Indian workshop uses a high-pressure air compressor for pneumatic tools and requires reliable fluid monitoring.

How this product helps

The Boltigen 1'' NPT Stainless Steel Oil Sight Glass ensures clear visibility of oil levels and potential contaminants like water, even under 800 PSI pressure and high temperatures common in Indian workshops. Its durable construction prevents leaks and failures, maintaining operational efficiency.

2
Scenario 2
Illustrative example
Where it helps

A manufacturing unit in a humid Indian region needs to monitor oil in hydraulic systems where moisture ingress is a concern.

How this product helps

This sight glass's robust materials and clear viewing window allow easy detection of water or oil degradation. The NPT thread ensures a secure fit for high-pressure systems, and the imported quality offers greater reliability than many local options, reducing maintenance downtime.

Specifications & installation

Specifications

Primary MaterialStainless Steel 304
Window MaterialTempered Borosilicate Glass
Seal MaterialNBR O-ring
Free FromPlastic components in critical seal areas

Installation & usage

InstallationScrew into a 1'' NPT female port. Ensure a proper seal with thread sealant if necessary. Hand-tighten and then use a wrench on the hex head for final snugging, avoiding over-tightening.
MaintenancePeriodically inspect the glass for cracks or cloudiness. Clean the exterior of the glass with a mild solvent if needed. Ensure the o-ring remains intact and properly seated.
ApplicationTanks, air compressors, pumps, piping systems, automotive industries, lab equipment, bearing housing, mixers.
Visual Inspection ForWater, oil, and gas (WOG)
Cost per use1 unit at ₹4,230 — ₹4,230 per unit
Shelf life after opening12 months (typical for durable components)
ContraindicationsEquipment using BSP threads or non-NPT compatible ports without an adapter; fluids incompatible with stainless steel, borosilicate glass, or NBR.
Allergens / common irritantsN/A (component is not ingested or applied to skin)

How we compare

FeatureBoltigen 1'' NPTOthers
Material QualitySolid 304 Stainless Steel body, Tempered Borosilicate Glass window, NBR O-ringOften plastic or lower-grade metal bodies, standard glass, rubber seals. Varies by brand.
Pressure Rating800 PSI (55 bar)Typically lower, around 300-500 PSI (20-35 bar). Varies by brand.
Temperature Range-30°C to 120°C (-22°F to 248°F)Often narrower range, e.g., 0°C to 80°C. Varies by brand.
Thread Standard1'' NPT MaleMay be NPT or BSP Male/Female. Requires adapter if incompatible.

Product details

SKUaqy7212
GTIN0730851396952
BrandBoltigen
Model Name1'' NPT Male Oil Sight Glass
Part NumberFSG002
Thread Size1'' NPT Male (Nominal Pipe Size)
Thread Pitch2.209mm
MaterialStainless Steel 304 (Body), Tempered Borosilicate Glass (Window), NBR (O-ring)
ColorSilver
Working Pressure800 PSI (55 bar)
Operating Temperature-30°C to 120°C (-22°F to 248°F)
Dimensions (approx.)5.2cm (Width) x 6.3cm (Height) x 4.0cm (Length)
Weight (approx.)0.132 kg
Country of OriginNot stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners

About Boltigen

Boltigen specializes in high-quality industrial components, focusing on sight glasses, level gauges, and related fluid monitoring equipment designed for demanding applications.

Compliance & Legal

No product-specific compliance warnings identified. Standard imported-goods terms apply: customs duties & GST paid; for personal use in India; follow the manufacturer's usage instructions on the packaging.

Customer Reviews

Share your experience

Bought this from CrowCrowCrow? Other buyers want to hear how it went.

No reviews from buyers in India yet. Be the first to share your experience!

FAQ, See What Others Asked

How to buy an original Boltigen 1'' NPT Stainless Steel Oil Sight Glass in India?
To buy an original Boltigen 1'' NPT Stainless Steel Oil Sight Glass in India, purchase from authorized US retailers and authorized brand partners like CrowCrowCrow. We import products directly, ensuring they are factory-sealed and authentic. All customs duties and GST are included in the listed INR price, and your order is shipped via ExpressBox with tracking for a transparent delivery experience.
Will these air compressor fittings work with my existing compressor and tools?
This Boltigen sight glass uses a 1'' NPT male thread. NPT (National Pipe Taper) is common in US-market equipment. If your compressor or tools use BSP (British Standard Pipe) threads, you will need to purchase a separate NPT to BSP adapter to ensure a proper seal and prevent leaks. Always verify your existing thread standard before purchasing.
What is the Boltigen 1'' NPT Stainless Steel Oil Sight Glass made of?
The Boltigen oil sight glass is constructed from solid 304 stainless steel for the body, a tempered borosilicate glass for the window, and an NBR o-ring for sealing. This combination offers superior durability and resistance to wear and bursting compared to plastic alternatives.
What is the pressure and temperature rating for this oil sight glass?
This stainless steel oil sight glass is rated to work under a pressure of 800 PSI (55 bar) and within a temperature range of -30°C to 120°C (-22°F to 248°F). It has undergone factory pressure and temperature tests to ensure it meets these specifications.
Can I see water or other contaminants with this sight glass?
Yes, the tempered borosilicate glass window, combined with a baffle and red ball, provides a clear view of the oil's color, clarity, and any accumulation of water or other contaminants. This allows for easy visual inspection of the medium within tanks and systems.

Frequently bought together

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks

This item:

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks

₹4,230

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks

This item

Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks

₹4,230

Total price:

₹7,810

You save ₹2,570 (25%) Extra

3 items selected

3 items

₹7,810

You save ₹2,570 (25%) Extra

Product Comparison

Attributes
Current
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic Tanks
Boltigen 1'' NPT Stainless Steel Oil Sight Glass Liquid Level Gauge | Hex Head Indicator Window for Air Compressors & Hydraulic TanksBuy Now
GODESON 1/4" NPT Brass Schrader Tank Valve 4-Pack | Anti-Corrosion, 200 PSI Max Working Pressure
GODESON 1/4" NPT Brass Schrader Tank Valve 4-Pack | Anti-Corrosion, 200 PSI Max Working PressureBuy Now
GODESON 1/8" NPT Brass Schrader Tank Valve 4-Pack | Anti-Corrosion, 200 PSI Max Working Pressure
GODESON 1/8" NPT Brass Schrader Tank Valve 4-Pack | Anti-Corrosion, 200 PSI Max Working PressureBuy Now
LE LEMATEC AI303-R1 Paint Sprayer Regulator with Gauge & Water Separator | Professional Air Control for Flawless Finishes
LE LEMATEC AI303-R1 Paint Sprayer Regulator with Gauge & Water Separator | Professional Air Control for Flawless FinishesBuy Now
La La Pet High Pressure Air Filter Water-Oil Separator 30MPa | Aluminum, Gold
La La Pet High Pressure Air Filter Water-Oil Separator 30MPa | Aluminum, GoldBuy Now
La La Pet High Pressure PCP Hand Pump Air Filter Water-Oil Separator 8mm | 30MPa Resistance
La La Pet High Pressure PCP Hand Pump Air Filter Water-Oil Separator 8mm | 30MPa ResistanceBuy Now
Boltigen 3/4" NPT Male Hex Head Stainless Steel Oil Sight Glass Liquid Level Gauge | 800 PSI Pressure Rated
Boltigen 3/4" NPT Male Hex Head Stainless Steel Oil Sight Glass Liquid Level Gauge | 800 PSI Pressure RatedBuy Now
Spec
Price
₹4,230
₹5,750
₹1,880
₹2,500
₹1,700
₹2,130
₹5,650
₹8,800
₹3,380
₹6,290
₹2,840
₹6,290
₹3,830
₹5,050
Brand NameBoltigenGODESONGODESONLE LEMATECLa La PetLa La PetBoltigen
SourceUS RetailUS RetailUS RetailUS RetailUS RetailUS RetailUS Retail
Sold ByCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrowCrow
Imported from USA
₹4,230₹5,750

You Save ₹1,520

Estimated doorstep delivery by 9 Nov - 11 Nov from USA
Add on Google
Visa
Mastercard
Google Pay
UPI
15-Point QC Passed
😊14-Day Smile Guarantee

Fast Shipping

Secure Packaging

14-Day Returns*

Quality & authenticity

Security & Privacy

Safe payments
Secure privacy

Tracked delivery

Tracked from USA · duties included
Genuine USA Imported Product
Damaged? Covered*

*Genuine defect, damage, wrong item or non-delivery, reported within 14 days; refund after inspection. Conditions

Your Order Journey: From Purchase to Doorstep

You Order
Place your order
USA Warehouse dispatch
Packed & shipped
International Air Shipping
Fast transit
Consignment to India Warehouse
Customs cleared
Doorstep delivery
Delivered to you
You Order
Place your order
USA Warehouse dispatch
Packed & shipped
International Air Shipping
Fast transit
Consignment to India Warehouse
Customs cleared
Doorstep delivery
Delivered to you

Why shop with us

Crowcrowcrow: The Only Safe Lane for US-Market Exclusives

One price. One payment. No surprises.

High risk

Buying Direct

Recommended

Crowcrowcrow

Safe Lane

vs
₹12,690+ (3× the price)
₹4,230 locked, all-in
Hard to get the original US version in India
Original US version, shipped to your door
Extra pay for Import Duties, GST, and forex fees
One price in INR, no customs charges at delivery
4–12 weeks · No tracking
15-17 days · live tracking
Grey market, no guarantee, no protection, no refund
Sourced from US retailers, India-verified, return available
Lost in transit = ₹0 back
Full protection included