Aluminum Alloy Visual Oil Flow Indicator for Fuel Dispensing Systems

Product Description (Google Promotion Style)

Real-time confirmation of fuel flow is essential for safe and efficient fueling operations. The FGSYQ-4 Series Visual Oil Flow Indicators are designed for installation between the fuel dispenser hose and the nozzle, providing clear visual feedback so operators can instantly verify fuel is flowing without additional instruments.

This product is known by different names worldwide:

USA: Fuel Flow Indicator / Inline Sight Glass

UK & Commonwealth: Fuel Sight Indicator

Europe (Germany, France, etc.): Kraftstoffflussanzeiger

Asia: Petrol Flow Visual Indicator / Acrylic Sight Glass

Despite the different names, the core function remains the same: providing a clear, reliable visual check of fuel movement for safer dispensing operations.

Innovative Acrylic Sight Glass Design

The FGSYQ-4 features a red internal rotor made from oil-resistant plastic, which spins clearly when fuel passes through, offering intuitive, real-time feedback. The sight glass itself is constructed from high-transparency acrylic, providing impact resistance, fuel resistance, and corrosion resistance. Compared to traditional glass, it is safer and more durable for high-intensity fueling environments.

Internal red rotor: visually confirms fuel flow

Acrylic sight glass: transparent, impact-resistant, oil- and corrosion-resistant

Aluminum alloy body: lightweight, strong, and easy to install

Flexible Connection Options

The FGSYQ-4 series offers versatile connection options, compatible with either hose couplings or swivel connectors. It supports both NPT and BSP thread standards, with sizes covering 3/4" and 1", making it suitable for a wide range of fuel systems.

Thread Specifications:

3/4” F NPT x 3/4” M NPT

3/4” F BSP x 3/4” M BSP

1” F NPT x 1” M NPT

1” F BSP x 1” M BSP

Seal Options: Viton® or Buna-N, chemical- and fuel-resistant

Body Material: Aluminum alloy with electroplated surface for corrosion resistance

Rotor Material: Oil-resistant plastic

Spring Material: Stainless steel

Key Benefits

Visual confirmation of fuel flow: monitor flow instantly without extra instruments

Easy installation: lightweight aluminum body, compatible with multiple couplings

High safety: acrylic sight glass is impact- and corrosion-resistant; red rotor clearly indicates flow

Wide application: fuel stations, LPG systems, and industrial fuel transfer

The FGSYQ-4 Series Visual Oil Flow Indicator provides a safe, reliable, and intuitive solution for fuel flow monitoring, making it an ideal choice for modern fuel management systems.

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Specification
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The FGSYQ-4 Series Oil Flow Indicators are designed for installation between the fuel dispenser hose and the fuel nozzle. They provide clear visual confirmation that fuel is flowing through the hose and into the nozzle. These indicators help operators quickly verify proper fuel delivery during dispensing operations, enhancing safety and efficiency at fueling stations. The device features a red internal rotor, made of oil-resistant plastic, which spins visibly as fuel passes through. This intuitive visual feedback allows real-time monitoring of fuel movement without the need for additional instruments. The indicator body is constructed from lightweight aluminum alloy, offering an excellent strength-to-weight ratio for ease of handling, installation, and long-term durability in demanding fueling environments.

Ordering Specifications:

Item No.	Thread Standard & Size
HBSYQ-4-3/4-1	3/4” F NPT x 3/4” M NPT
HBSYQ-4-3/4-2	3/4” F BSP x 3/4” M BSP
HBSYQ-4-1-3	1” F NPT x 1” M NPT
HBSYQ-4-1-4	1” F BSP x 1” M BSP
“F” means female thread, “M” means male thread

Technical Specifications:

Body Material: Aluminum Alloy

Surface Treatment: electroplating

Rotor Material: Oil-Resistant Plastic

Main Seals: Viton® or Buna-N

Main Spring: Stainless Steel

Connection Types: NPT or BSP

Standard Sizes: 3/4" and 1"

Key Features and Benefits:

Visual Fuel Flow Monitoring

The internal red rotor rotates clearly when fuel flows through, providing immediate confirmation of fuel delivery.

Flexible Connection Options

Female-threaded end can be equipped with a hose coupling or a swivel connector, based on customer needs.

Lightweight and Durable

The aluminum alloy body offers corrosion resistance and easy installation without compromising strength.

Other Similar Products: For more information or custom requirements, please contact our technical support team or sales representative.

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About Haibo

Zhejiang Haibo Petroleum Equipment Co., Ltd., established in 2017, is a certified enterprise located in Yongjia County, Wenzhou City, Zhejiang Province—recognized globally as the world’s largest manufacturing base for petroleum equipment and the well-known hometown of pumps and valves in China.
Our products are widely used in Fluid Control Systems, Energy Systems, Measurement Systems, Piping Systems, and Hydraulic Systems, serving petroleum companies, military units, oil depots, tank truck manufacturers, and petrol stations worldwide. Province—recognized globally as the world’s largest manufacturing base for petroleum equipment and the well-known hometown of pumps and valves in China.
At Haibo, we are backed by a team of senior industry experts with more than 20 years of professional experience in the petroleum equipment and fluid control sectors. Their deep technical knowledge and industry insight ensure that every product and solution we deliver meets the highest standards of quality, reliability, and performance.

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Aluminum Alloy Visual Oil Flow Indicator for Fuel Dispensing Systems