Southland 521-222HC Black Iron Merchant Coupling 3/8 in

Product Description

The SOUTHLAND 521-222HC is a 3/8 inch malleable black iron merchant coupling designed to join two sections of straight pipe in low-pressure piping systems. This standard coupling provides a reliable threaded connection for plumbers, pipefitters, and mechanical contractors working on water, oil, air, or gas distribution lines. Malleable black iron construction gives the fitting durability and resistance to mechanical stress, making it suitable for above-ground and in-wall rough-in applications. Its standard merchant coupling profile keeps installation straightforward on any compatible threaded pipe run.

This coupling is commonly used in residential and light commercial piping installations where low-pressure service is required. Typical applications include water supply lines, compressed air distribution, fuel oil piping, and natural gas branch lines. The 3/8 inch pipe size makes it a common choice for branch lines and secondary runs in gas and air systems. Plumbers and pipefitters install this fitting as part of threaded iron pipe assemblies during new construction and retrofit work.

Key Features

• Malleable black iron construction for durability in low-pressure service
• 3/8 inch pipe size for branch and secondary line applications
• Straight pipe-to-pipe connection with standard threaded ends
• Suitable for water, oil, air, and gas piping systems
• Sold individually for precise quantity ordering

Compatibility

Designed as an OEM-style replacement and standard-service fitting for 3/8 inch threaded malleable iron pipe systems in low-pressure residential and commercial applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing and mechanical codes, including IPC and IFGC requirements where gas service is involved. Shut off and depressurize the supply line fully before removing or installing any threaded fitting. Apply an appropriate thread sealant or pipe tape rated for the service medium before tightening. Do not overtighten malleable iron fittings, as this can crack the fitting body.

Technical Specifications

• Pipe Size: 3/8 inches
• Material: Malleable black iron
• Fitting Type: Merchant coupling
• Connection Type: Threaded (straight pipe to straight pipe)
• Weight: 0.006 pounds
• UPC: 00032888363670

Standard Information

• Brand: SOUTHLAND
• Manufacturer Part Number: 521-222HC