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Dwyer Window Sight Flow Indicator with Impeller: Rotor, Bronze, 3/8 in FNPT - Flow Sights with Indicator
DwyerFlow Sights with Indicator

Dwyer Window Sight Flow Indicator with Impeller: Rotor, Bronze, 3/8 in FNPT

The DWYER Window Sight Flow Indicator with Impeller: Rotor (SKU 21XL68, MPN SFI-300-3/8) is a bronze flow sight with a tempered glass window and a Buna-N seal and wetted material. Designed for glycol media, it…

SKU 3G-OTH-92072

Brand
Dwyer
Item
Window Sight Flow Indicator with Impeller: Rotor, Bronze, 3/8 in FNPT
Category
Flow Sights with Indicator
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Technical Specifications

Dwyer
Manufacturer Part Number
SFI-300-3/8
Type
Bronze
FNPT
3/8 in
Seal Material
Buna-N
Flow Direction
Vertical Down
For Media Type
Glycol
Sight Material
Tempered Glass
Connection Size
3/8 in
Connection Type
FNPT
Wetted Material
Buna-N
View Full Spec Sheet

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

Product Description

The DWYER Window Sight Flow Indicator with Impeller: Rotor (SKU 21XL68, MPN SFI-300-3/8) is a bronze flow sight with a tempered glass window and a Buna-N seal and wetted material. Designed for glycol media, it features a 3/8-inch FNPT connection and requires vertical down flow direction.

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

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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DWYER Window Sight Flow Indicator with Impeller: Rotor, Bronze, 1/4 in FNPT, 1/4 in Connection Size (MPN SFI-300-1/4). Key specifications — For Media Type: Water; Brand: DWYER; Sight Material: Tempered Glass; Connection Type: FNPT; Flow Direction: Vertical Down; Seal Material: Buna-N; Wetted Material: PTFE.
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DWYER Window Sight Flow Indicator with Impeller: Rotor, Bronze, 3/4 in FNPT, 3/4 in Connection Size (MPN SFI-300-3/4). Key specifications — For Media Type: Water; Brand: DWYER; Sight Material: Tempered Glass; Connection Type: FNPT; Flow Direction: Vertical Up; Seal Material: Buna-N; Wetted Material: PTFE.
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DWYER Window Sight Flow Indicator with Impeller: Rotor, Bronze, 3/4 in FNPT, 3/4 in Connection Size (MPN SFI-300-3/4). Key specifications — For Media Type: Water; Brand: DWYER; Sight Material: Tempered Glass; Connection Type: FNPT; Flow Direction: Vertical Up; Seal Material: Buna-N; Wetted Material: PTFE.
DWYER Window Sight Flow Indicator with Impeller: Rotor, Bronze, 1 1/2 in FNPT, FNPT, Tempered Glass (MPN SFI-100-1-1/2). Key specifications — For Media Type: Glycol; Brand: DWYER; Sight Material: Tempered Glass; Connection Type: FNPT; Flow Direction: Vertical Up; Seal Material: Buna-N; Wetted Material: Buna-N.
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DWYER Window Sight Flow Indicator with Impeller: Rotor, Bronze, 1 1/2 in FNPT, FNPT, Tempered Glass (MPN SFI-100-1-1/2). Key specifications — For Media Type: Glycol; Brand: DWYER; Sight Material: Tempered Glass; Connection Type: FNPT; Flow Direction: Vertical Up; Seal Material: Buna-N; Wetted Material: Buna-N.