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Watts 4 909 AGK Air Gap for 909M1 Reduced Pressure Zone Assemblies - Air Gaps
WattsAir Gaps

Watts 4 909 AGK Air Gap for 909M1 Reduced Pressure Zone Assemblies

The Watts Air Gap (SKU 4 909 AGK, MPN 4 909 AGK) is a cast-iron air gap designed for use with Series 909M1 Reduced Pressure Zone Assemblies. It features female NPT connections and is compatible with the 909M1 series.

SKU 3G-OTH-444551

Also listed as: 4909AGK · 4-909-AGK

Brand
Watts
Item
4 909 AGK Air Gap for 909M1 Reduced Pressure Zone Assemblies
Category
Air Gaps
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Delivery
Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
Payment
Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

Watts
Manufacturer Part Number
4 909 AGK
Type
909/909M1, Cast Iron, Reduced Pressure Zone Assemblies, Female, NPT
Product Type
Air Gap
Compatible with Series
909M1
Compatible Product Type
Reduced Pressure Zone Assemblies

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

Product Description

The Watts Air Gap (SKU 4 909 AGK, MPN 4 909 AGK) is a cast-iron air gap designed for use with Series 909M1 Reduced Pressure Zone Assemblies. It features female NPT connections and is compatible with the 909M1 series.

Frequently Asked Questions

What is the Watts Air Gap 4 909 AGK used for?

The Watts Air Gap 4 909 AGK is used to prevent backflow in water systems by providing a physical separation between a potable water supply and a non-potable source. It is designed for use with Series 909M1 Reduced Pressure Zone Assemblies in commercial and industrial plumbing applications.

What are the specifications of the Watts Air Gap 4 909 AGK?

The Watts Air Gap 4 909 AGK is a cast-iron air gap compatible with Series 909M1 Reduced Pressure Zone Assemblies. It features female NPT connections and is designed for use with reduced pressure zone assemblies. The manufacturer part number is 4 909 AGK.

Where to buy the Watts Air Gap 4 909 AGK worldwide?

The Watts Air Gap 4 909 AGK is available to order through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to worldwide destinations. Contact us for availability and lead time.

How to install the Watts Air Gap 4 909 AGK?

Install the Watts Air Gap 4 909 AGK by connecting it to the Series 909M1 Reduced Pressure Zone Assembly using female NPT fittings. Ensure the air gap is positioned vertically with adequate clearance for drainage. Follow local plumbing codes and the manufacturer's instructions for proper backflow prevention.

Used in

Common applications for Watts
Industrial burner gas safety systems — Watts HF2000 filters with GF-series seal kits maintain clean, regulated gas supply to burner pilot and main flame controls
Commercial heating and boiler installations — Modular filter assemblies support preventive maintenance and component replacement without full system shutdown
Process gas delivery pipelines — DN25 through DN125 filter bodies accommodate varying flow rates and inlet pressures across manufacturing and chemical processes
Gas pressure regulation benches — Multi-stage Watts filter platforms integrate with pressure reducers and safety shutoff valves in test and calibration environments
Equipment retrofit and upgrade projects — Available connection sizes and seal kits enable adaptation of newer Watts components into legacy gas control systems
Planned maintenance and spare-parts inventory — Filter seal kits allow facilities to stock consumables in advance, reducing downtime during scheduled gas system servicing

Watts Products

3G Electric supplies Watts air gaps. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Compatible alternatives & equivalents

Cross-referenced by specification & description
Repair part for Watts Series 009 backflow preventers, model 009-909-AG-A. Features a 1/2-inch female NPT connection. Used to maintain a physical air gap in backflow prevention assemblies for potable water systems
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Repair part for Watts Series 009 backflow preventers, model 009-909-AG-A. Features a 1/2-inch female NPT connection. Used to maintain a physical air gap in backflow prevention assemblies for potable water systems
Cast iron air gap fitting with 4-inch NPT connection on side 1. Designed for use with 475V series pressure principle backflow preventers to create a physical air gap between the preventer and a drain, preventing backflow contamination in water systems
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Cast iron air gap fitting with 4-inch NPT connection on side 1. Designed for use with 475V series pressure principle backflow preventers to create a physical air gap between the preventer and a drain, preventing backflow contamination in water systems
Cast iron air gap fitting with NPT connections, designed for use with 975XL and 975XL2 series pressure principle backflow preventers. Complies with ANSI/ASME A112.1.2. Creates a physical air gap between the backflow preventer and discharge point to prevent backflow contamination in water systems
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Cast iron air gap fitting with NPT connections, designed for use with 975XL and 975XL2 series pressure principle backflow preventers. Complies with ANSI/ASME A112.1.2. Creates a physical air gap between the backflow preventer and discharge point to prevent backflow contamination in water systems
ZURN WILKINS Air Gap Fitting: Air Gap Fitting, 475V, Cast Iron, 2 1/2 in Connection Size - Side 1 (MPN AG-6)
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ZURN WILKINS Air Gap Fitting: Air Gap Fitting, 475V, Cast Iron, 2 1/2 in Connection Size - Side 1 (MPN AG-6)
Cast iron air gap fitting with 1/4 inch NPT connection on side 1. Designed for use with 975XL/975XL2 series pressure principle backflow preventers to create a physical air gap between the preventer and a drain, preventing backflow contamination in water systems
ZURN
Cast iron air gap fitting with 1/4 inch NPT connection on side 1. Designed for use with 975XL/975XL2 series pressure principle backflow preventers to create a physical air gap between the preventer and a drain, preventing backflow contamination in water systems
Nylon air gap fitting with 1/2 in connection size on Side 1, designed for use with Series 375 and 375XL pressure principle backflow preventers. Creates a physical air gap between the backflow preventer and a drain or discharge point to prevent backflow contamination in plumbing systems
ZURN WILKINS
Nylon air gap fitting with 1/2 in connection size on Side 1, designed for use with Series 375 and 375XL pressure principle backflow preventers. Creates a physical air gap between the backflow preventer and a drain or discharge point to prevent backflow contamination in plumbing systems

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Bronze air gap with female NPT connections, designed for use with Series 995 reduced pressure zone assemblies. Provides physical separation in backflow prevention systems to prevent contamination of potable water supplies. Compatible with 009, 009M2, 009M3, and 995 series assemblies