Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
RFQ CartGet a QuoteSign inSign up
MUELLER Sweat Connection Sight Glass - Sweat Connection Sight Glasses
MUELLERSweat Connection Sight Glasses

MUELLER Sweat Connection Sight Glass

The MUELLER Sight Glass (MPN A 18119) is a sweat connection sight glass made of brass, with a length of 6 11/16 inches and a cut-out length of 5.15 inches. This brass sight glass is designed for sweat connection…

SKU 3G-OTH-71903

Also listed as: A18119 · A-18119

Brand
MUELLER
Item
Sweat Connection Sight Glass
Category
Sweat Connection Sight Glasses
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

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

MUELLER
Manufacturer Part Number
A 18119
Material
Brass

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

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

Product Description

The MUELLER Sight Glass (MPN A 18119) is a sweat connection sight glass made of brass, with a length of 6 11/16 inches and a cut-out length of 5.15 inches. This brass sight glass is designed for sweat connection installation.

Frequently Asked Questions

What is the MUELLER Sight Glass A 18119 used for?

The MUELLER Sight Glass A 18119 is used to provide visual indication of fluid flow or level in piping systems. Its brass construction and sweat connection design make it suitable for HVAC, refrigeration, and industrial process lines where a clear view of the medium is required.

What are the specifications of the MUELLER Sight Glass A 18119?

The MUELLER Sight Glass A 18119 is made of brass, has a length of 6 11/16 inches, and a cut-out length of 5.15 inches. It features a sweat connection for installation. The manufacturer part number is A 18119.

Where to buy MUELLER Sight Glass A 18119 worldwide?

You can source the MUELLER Sight Glass A 18119 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 a MUELLER sweat connection sight glass?

To install a MUELLER sweat connection sight glass, clean and flux the pipe ends and the sight glass connections. Heat the joint evenly with a torch until solder flows into the gap. Allow to cool naturally. Ensure the glass is oriented for clear viewing and check for leaks after installation.

Used in

Common applications for MUELLER
Commercial refrigeration systems — Mueller steel shell filter driers for moisture and contaminant removal in liquid lines.
HVAC installations — Mueller sweat connection ball valves for flow control in refrigerant circuits.
Industrial process cooling — Mueller magnetic check valves to prevent backflow in refrigerant piping.
Refrigeration system maintenance — Mueller flare nuts and bushings for access valve connections.
Low-GWP refrigerant systems — Mueller A2L-compatible ball valves for use with low-flammability refrigerants.
Retrofit projects — Mueller filter driers and valves for upgrading existing refrigeration equipment.

MUELLER Products

3G Electric supplies MUELLER sweat connection sight glasses. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Compatible alternatives & equivalents

Cross-referenced by specification & description
This brass sight glass features sweat connections for copper pipe installation, allowing visual inspection of fluid flow in piping systems. It is commonly used in HVAC, refrigeration, and industrial process lines to monitor liquid or gas movement, detect bubbles, or verify system charge without disassembly
MUELLER
This brass sight glass features sweat connections for copper pipe installation, allowing visual inspection of fluid flow in piping systems. It is commonly used in HVAC, refrigeration, and industrial process lines to monitor liquid or gas movement, detect bubbles, or verify system charge without disassembly
This sight glass features a flared swivel connection for easy alignment in piping systems. Constructed of brass, it provides visual flow monitoring to observe fluid movement and detect blockages. Suitable for use in HVAC, refrigeration, and process lines
MUELLER
This sight glass features a flared swivel connection for easy alignment in piping systems. Constructed of brass, it provides visual flow monitoring to observe fluid movement and detect blockages. Suitable for use in HVAC, refrigeration, and process lines
This sight glass features a flared swivel connection for easy alignment in piping systems. Constructed of brass, it allows visual monitoring of fluid flow, color, and clarity. Commonly used in HVAC, refrigeration, and process lines
MUELLER
This sight glass features a flared swivel connection for easy alignment in piping systems. Constructed of brass, it allows visual monitoring of fluid flow, color, and clarity. Commonly used in HVAC, refrigeration, and process lines
This sight glass features a flared swivel connection and is constructed from brass. It is used for visual flow monitoring in industrial piping systems, allowing operators to confirm fluid presence and clarity in applications such as lubrication, cooling, and process lines
MUELLER
This sight glass features a flared swivel connection and is constructed from brass. It is used for visual flow monitoring in industrial piping systems, allowing operators to confirm fluid presence and clarity in applications such as lubrication, cooling, and process lines
This flared swivel connection sight glass is constructed of brass for visual fluid monitoring in piping systems. The swivel design facilitates alignment during installation, allowing observation of flow, clarity, or liquid presence in lines
MUELLER
This flared swivel connection sight glass is constructed of brass for visual fluid monitoring in piping systems. The swivel design facilitates alignment during installation, allowing observation of flow, clarity, or liquid presence in lines
This MUELLER sight glass features a brass body with flare connections for visual inspection of fluid flow in piping systems. It is commonly used in refrigeration, HVAC, and process lines to monitor flow, color, or clarity. The 2-7/8 inch length allows for easy installation in tight spaces
MUELLER
This MUELLER sight glass features a brass body with flare connections for visual inspection of fluid flow in piping systems. It is commonly used in refrigeration, HVAC, and process lines to monitor flow, color, or clarity. The 2-7/8 inch length allows for easy installation in tight spaces

More from MUELLER

View all MUELLER parts →
Copper sight glass with sweat connections for permanent installation in copper piping systems. Overall length 7-7/8 inches, cut-out length 5.95 inches. Allows visual monitoring of fluid flow to detect blockages or confirm circulation in HVAC, refrigeration, and plumbing lines
MUELLER
Copper sight glass with sweat connections for permanent installation in copper piping systems. Overall length 7-7/8 inches, cut-out length 5.95 inches. Allows visual monitoring of fluid flow to detect blockages or confirm circulation in HVAC, refrigeration, and plumbing lines
This MUELLER sight glass is constructed of brass and features sweat connections for copper pipe installation. It allows visual inspection of fluid flow or level in piping systems without opening the line. Overall length is 5 3/4 inches with a 4.93-inch cut-out length. Suitable for use in HVAC, plumbing, and process lines
MUELLER
This MUELLER sight glass is constructed of brass and features sweat connections for copper pipe installation. It allows visual inspection of fluid flow or level in piping systems without opening the line. Overall length is 5 3/4 inches with a 4.93-inch cut-out length. Suitable for use in HVAC, plumbing, and process lines
This MUELLER sight glass is constructed of brass and features sweat connections for permanent copper-tube installation. It provides visual confirmation of fluid flow, level, or condition in a pipeline. Commonly used in HVAC, refrigeration, and industrial process systems to monitor refrigerant or liquid flow without opening the line
MUELLER
This MUELLER sight glass is constructed of brass and features sweat connections for permanent copper-tube installation. It provides visual confirmation of fluid flow, level, or condition in a pipeline. Commonly used in HVAC, refrigeration, and industrial process systems to monitor refrigerant or liquid flow without opening the line
Copper sight glass for sweat (solder) installation into copper piping systems. Provides visual indication of fluid flow, color, and clarity without opening the line. Overall length 7 7/8 inches, cut-out length 5.2 inches. Suitable for HVAC, refrigeration, and industrial process applications
MUELLER
Copper sight glass for sweat (solder) installation into copper piping systems. Provides visual indication of fluid flow, color, and clarity without opening the line. Overall length 7 7/8 inches, cut-out length 5.2 inches. Suitable for HVAC, refrigeration, and industrial process applications
Copper sight glass with sweat (solder) connections for visual flow monitoring in copper piping systems. Used in HVAC, refrigeration, and process lines to observe fluid movement, detect blockages, or confirm flow presence. Length 6 5/16 inches, cut-out length 4.49 inches
MUELLER
Copper sight glass with sweat (solder) connections for visual flow monitoring in copper piping systems. Used in HVAC, refrigeration, and process lines to observe fluid movement, detect blockages, or confirm flow presence. Length 6 5/16 inches, cut-out length 4.49 inches
This MUELLER sight glass is constructed of brass and features sweat connections for copper pipe installation. It allows visual inspection of fluid flow in piping systems, commonly used in HVAC, refrigeration, and process lines. Overall length is 5 3/4 inches with a cut out length of 4.69 inches
MUELLER
This MUELLER sight glass is constructed of brass and features sweat connections for copper pipe installation. It allows visual inspection of fluid flow in piping systems, commonly used in HVAC, refrigeration, and process lines. Overall length is 5 3/4 inches with a cut out length of 4.69 inches
This MUELLER sight glass is made of copper and features sweat connections for installation in copper piping systems. It allows visual monitoring of fluid flow, enabling operators to detect blockages or confirm circulation. Suitable for HVAC, refrigeration, and process lines
MUELLER
This MUELLER sight glass is made of copper and features sweat connections for installation in copper piping systems. It allows visual monitoring of fluid flow, enabling operators to detect blockages or confirm circulation. Suitable for HVAC, refrigeration, and process lines
Brass sweat connection sight glass with 5 1/16 inch overall length and 4.5 inch cut out length. Used in HVAC and refrigeration piping to provide visual indication of refrigerant flow, moisture, or bubbles
MUELLER
Brass sweat connection sight glass with 5 1/16 inch overall length and 4.5 inch cut out length. Used in HVAC and refrigeration piping to provide visual indication of refrigerant flow, moisture, or bubbles