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Dwyer SFI-300-1/4 Bronze Sight Flow Indicator with Rotor, 1/4 in FNPT - Flow Sights with Indicator
DwyerFlow Sights with Indicator

Dwyer SFI-300-1/4 Bronze Sight Flow Indicator with Rotor, 1/4 in FNPT

The DWYER SFI-300-1/4 is a Window Sight Flow Indicator with Impeller: Rotor, designed for water media in vertical down flow. It features a bronze body, 1/4 in FNPT connections, tempered glass sight, Buna-N seal, and…

SKU 3G-OTH-91932

Also listed as: SFI30014 · SFI 300 1 4 · SFI-300-1-4

Brand
Dwyer
Item
SFI-300-1/4 Bronze Sight Flow Indicator with Rotor, 1/4 in FNPT
Part Number
SFI-300-1/4
Category
Flow Sights with Indicator
Available to Order
Also known as:SFI-300-1/4Dwyer
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Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

Dwyer
Manufacturer Part Number
SFI-300-1/4
Type
Bronze
Seal Material
Buna-N
Flow Direction
Vertical Down
For Media Type
Water
Sight Material
Tempered Glass
Connection Size
1/4 in
Wetted Material
PTFE

Technical Documents

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Dwyer Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The DWYER SFI-300-1/4 is a Window Sight Flow Indicator with Impeller: Rotor, designed for water media in vertical down flow. It features a bronze body, 1/4 in FNPT connections, tempered glass sight, Buna-N seal, and PTFE wetted material.

Frequently Asked Questions

What is the Dwyer SFI-300-1/4 sight flow indicator used for?

The Dwyer SFI-300-1/4 is used to visually verify water flow in vertical-down piping systems. Its impeller rotor spins when flow is present, providing a clear indication through the tempered glass sight. Common applications include cooling water lines, process water monitoring, and pump discharge lines in industrial plants.

What are the specifications of the Dwyer SFI-300-1/4?

The Dwyer SFI-300-1/4 has a bronze body with 1/4 in FNPT connections, a tempered glass sight window, Buna-N seal, and PTFE wetted parts. It is designed for water media with vertical-down flow direction. The manufacturer part number is SFI-300-1/4.

Where to buy the Dwyer SFI-300-1/4 worldwide?

3G Electric supplies the Dwyer SFI-300-1/4 sight flow indicator to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this item. We source genuine Dwyer products for global industrial applications.

How to install a Dwyer SFI-300-1/4 sight flow indicator?

Install the Dwyer SFI-300-1/4 in a vertical pipe section with flow moving downward. Apply thread sealant to the 1/4 in FNPT connections and tighten to manufacturer torque specs. Ensure the tempered glass sight is clean and unobstructed. Verify the impeller rotor spins freely before pressurizing the line.

Used in

Common applications for Dwyer
Combustion air-filter monitoring — Magnehelic Series 2000 on burner air-intake filter banks
Clean-room and pharmaceutical pressurisation — Magnehelic / Capsuhelic differential-pressure gauges
HVAC fan-discharge static pressure — Mark II inclined-vertical manometers on AHU test points
Filter-blockage alarms — Photohelic Series 3000 combined gauge/switch on air-handling units
BMS-integrated pressure monitoring — Digihelic DH3 with 4–20 mA output for building management
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Dwyer Products

3G Electric supplies Dwyer flow sights with indicator. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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