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Watts Air Separator: Cast Iron Body, For Water, 1 1/4 in Female NPT, Horizontal - Inline Air Separators
WattsInline Air Separators

Watts Air Separator: Cast Iron Body, For Water, 1 1/4 in Female NPT, Horizontal

The Watts Air Separator with Cast Iron Body (MPN AS-M1-1-1/4) is an inline air separator designed for water systems. It features a 1 1/4 in Female NPT connection, horizontal orientation, and a maximum pressure of 80…

SKU 3G-OTH-71014

Also listed as: ASM1114 · AS M1 1 1 4 · AS-M1-1-1-4

Brand
Watts
Item
Air Separator: Cast Iron Body, For Water, 1 1/4 in Female NPT, Horizontal
Category
Inline Air Separators
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Local availability & support

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
AS-M1- 1-1/4
Type
For Water, Horizontal
Max
275°F
Max.
80 psi
Female NPT
1 1/4 in
Product Type
Air Separator

Technical Documents

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

Product Description

The Watts Air Separator with Cast Iron Body (MPN AS-M1-1-1/4) is an inline air separator designed for water systems. It features a 1 1/4 in Female NPT connection, horizontal orientation, and a maximum pressure of 80 psi with a maximum temperature of 275°F.

Frequently Asked Questions

What is a Watts air separator used for?

A Watts air separator removes entrained air and micro-bubbles from hydronic heating and cooling water systems. It improves system efficiency, reduces noise, and prevents corrosion and pump cavitation in commercial and industrial closed-loop applications.

What are the specifications of the Watts AS-M1-1-1/4 air separator?

The Watts AS-M1-1-1/4 air separator has a cast iron body, 1 1/4 in female NPT connections, horizontal orientation, maximum pressure of 80 psi, and maximum temperature of 275°F. It is designed for water systems only.

Where to buy a Watts air separator worldwide?

3G Electric supplies the Watts AS-M1-1-1/4 air separator to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for a quote and lead time on this and other Watts products.

How to install a Watts inline air separator?

Install the Watts air separator horizontally in the main supply line, typically at the highest point of the system or where air naturally collects. Ensure flow direction matches the arrow on the body. Use pipe sealant on NPT threads and support the cast iron body to avoid stress.

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 inline air separators. 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
Air Vent: One Port, Side Port, 1/8 in MNPT, For Water, Brass Body, 125 psi Max., 240°F Max., Bottom (MPN HAV- 1/8)
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Air Vent: One Port, Side Port, 1/8 in MNPT, For Water, Brass Body, 125 psi Max., 240°F Max., Bottom (MPN HAV- 1/8)
Air Vent: One Port, Top Port, 1/2 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 1/2)
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Air Vent: One Port, Top Port, 1/2 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 1/2)
Air Vent: One Port, Top Port, 3/4 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 3/4)
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Air Vent: One Port, Top Port, 3/4 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 3/4)
Air Vent: One Port, Top Port, 1 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 1)
Watts
Air Vent: One Port, Top Port, 1 in MNPT, For Water, Brass Body, 150 psi Max., 240°F Max., Bottom (MPN FV-4M1- 1)
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383308)
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383308)
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383025)
Watts
WATTS Pressure Relief Valve: FNPTF x FNPTF, 1 1/4 in x 1 1/2 in, Iron, 75 psi Max. Op Pressure (MPN 0383025)

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Air Separator: Cast Iron Body, For Water, 1 in Female NPT, Horizontal, 80 psi Max., 275°F Max. (MPN AS-M1- 1)
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