1/4″ to 1″ NPT L-Shape Brass Oil Level Sight Gauge Fluid Level Indicator for Hydraulic Tanks, Gearboxes & Air Compressors

Product Type: 90-Degree Elbow (L-Shape) Oil Level Sight Gauge
Body Material: High-Quality Solid Brass for maximum corrosion resistance.
Tube Material: Temperature-Resistant Transparent Glass
Protection: Includes a durable metal guard to prevent accidental breakage.
Thread Sizes: Available in 1/4″ NPT, 3/8″ NPT, and 1/2″ NPT Male Threads.
Tube Length Options: Comprehensive range from 80mm to 500mm to fit various tank depths.
Operating Temperature: -40°C to 300°C (-40°F to 572°F)
Primary Applications: Ideal for gearboxes, hydraulic reservoirs, crankcases, air compressors, and any industrial fluid tank requiring side-level monitoring.
We are a direct manufacturer offering complete OEM and ODM customization.

Share Now:

ROBUST & DURABLE CONSTRUCTION: Engineered for industrial environments, our L-shape sight gauge features a solid brass body and a high-strength glass tube protected by a sturdy metal outer guard. This heavy-duty design resists corrosion, impacts, and vibration, ensuring a long and reliable service life for your machinery.

CRYSTAL-CLEAR & ACCURATE MONITORING: Stop guessing your fluid levels. The high-transparency glass tube provides an unobstructed, crystal-clear view of the oil level, color, and condition. The 90-degree elbow design allows for easy viewing from the side, perfect for tight spaces where top-down observation is impossible.

HIGH-TEMPERATURE & PRESSURE RESISTANCE: Built to perform under pressure. This liquid level indicator operates flawlessly in extreme temperatures ranging from -40°C to 300°C (-40°F to 572°F). Its secure seals and robust build make it suitable for a wide range of hydraulic fluids, lubricants, and oils in high-demand systems.

EASY INSTALLATION & VERSATILE FIT: Get up and running in minutes. This oil level sight gauge comes with standard NPT male threads (available in 1/4″, 3/8″, and 1/2″ sizes) for a secure, leak-proof fit. Simply select the correct thread and tube length (from 80mm to 500mm) for a perfect match with your equipment.

WIDE APPLICATIONS & OEM CUSTOMIZATION: The perfect OEM replacement for gearboxes, air compressors, and hydraulic units. We also offer full OEM/ODM services. Whether you need custom lengths, special thread sizes (BSP, Metric), or bulk quantities for your production line, contact us to discuss your specific manufacturing requirements.

 

L-Shape Brass Oil Level Sight Gauge Technical Specification Matrix

Engineering Parameter Standard Industrial Specification Custom Options & Availability
Product Category L-Shape Oil Level Sight Gauge / Fluid Level Indicator Custom structural geometries (Straight, T-shape)
Housing Material Premium Solid Brass (High-strength structural grade) SUS 304, SUS 316L Stainless Steel, Aluminum 6061
Thread Configuration NPT Thread & BSP Thread Interchangeable Matrix BSPT, G Thread, Metric Threads (M10 to M60)
Standard Size Range 1/4″ to 1″ NPT (As per standard catalog) Full range custom tooling from 1/8″ up to 2″
Window Material High-Clarity Tempered Glass / Natural Borosilicate Fused Glass, PMMA Acrylic, Polycarbonate (PC)
Sealing O-Rings NBR (Nitrile Rubber) / EPDM Viton (FKM), PTFE for high-chemical resilience
Max Working Pressure Engineered up to 150 PSI (Dependent on size) Custom heavy-walled high-pressure variants up to 500 PSI
Max Temperature Range -20°C to +120°C (-4°F to 248°F) Configurable up to 280°C with specialty glass & seals
Global Standard Alignment Designed to meet global hydraulic tank & piping baselines DIN Standard, ANSI 150, EN1092, JIS 10K, ISO Baselines

Standard Thread Dimension Reference Table (BSP/NPT Conversion)

The following data serves as an engineering alignment tool for hydraulic tank, gearbox, and air compressor port sizing (subject to slight nominal manufacturing tolerances):

Nominal Thread Size Male Thread Outer Diameter (OD) Female Thread Inner Diameter (ID)
1/8″ 9.5 mm 8.8 mm
1/4″ 12.5 mm 11.5 mm
3/8″ 16.2 mm 15.3 mm
1/2″ 20.3 mm 19.5 mm
3/4″ 25.7 mm 24.0 mm
1″ 32.5 mm 30.5 mm
1-1/4″ 41.3 mm 39.5 mm
1-1/2″ 47.8 mm 46.3 mm
2″ 59.6 mm 56.6 mm

L-Shape Brass Oil Level Sight Gauge Technical Specification Matrix

Engineering Parameter Standard Industrial Specification Custom Options & Availability
Product Category L-Shape Oil Level Sight Gauge / Fluid Level Indicator Custom structural geometries (Straight, T-shape)
Housing Material Premium Solid Brass (High-strength structural grade) SUS 304, SUS 316L Stainless Steel, Aluminum 6061
Thread Configuration NPT Thread & BSP Thread Interchangeable Matrix BSPT, G Thread, Metric Threads (M10 to M60)
Standard Size Range 1/4″ to 1″ NPT (As per standard catalog) Full range custom tooling from 1/8″ up to 2″
Window Material High-Clarity Tempered Glass / Natural Borosilicate Fused Glass, PMMA Acrylic, Polycarbonate (PC)
Sealing O-Rings NBR (Nitrile Rubber) / EPDM Viton (FKM), PTFE for high-chemical resilience
Max Working Pressure Engineered up to 150 PSI (Dependent on size) Custom heavy-walled high-pressure variants up to 500 PSI
Max Temperature Range -20°C to +120°C (-4°F to 248°F) Configurable up to 280°C with specialty glass & seals
Global Standard Alignment Designed to meet global hydraulic tank & piping baselines DIN Standard, ANSI 150, EN1092, JIS 10K, ISO Baselines

Standard Thread Dimension Reference Table (BSP/NPT Conversion)

The following data serves as an engineering alignment tool for hydraulic tank, gearbox, and air compressor port sizing (subject to slight nominal manufacturing tolerances):

Nominal Thread Size Male Thread Outer Diameter (OD) Female Thread Inner Diameter (ID)
1/8″ 9.5 mm 8.8 mm
1/4″ 12.5 mm 11.5 mm
3/8″ 16.2 mm 15.3 mm
1/2″ 20.3 mm 19.5 mm
3/4″ 25.7 mm 24.0 mm
1″ 32.5 mm 30.5 mm
1-1/4″ 41.3 mm 39.5 mm
1-1/2″ 47.8 mm 46.3 mm
2″ 59.6 mm 56.6 mm

 

B2B Global Procurement & Custom OEM Notes:

  • Zero MOQ Limitation: Fanovo supports industrial distribution and machinery prototyping with No Minimum Order Quantity (Zero MOQ) restrictions on our standard brass fluid indicators.

  • Tailored Engineering Blueprints: Custom glass lengths, localized laser etching (for orientation arrows, fluid level markings, or custom brand logos), and unique hex-nut dimensions can be 100% machined from your 2D/3D blueprints.

  • Widespread OEM Integration: Perfectly dimensioned for heavy-duty hydraulic reservoirs, industrial gearboxes, lubrication pump stations, and rotary screw air compressors.

 

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

Related Posts

Still searching? We can help!

Contact us