Southland 521-205HN Black Iron Coupling 1 Inch

Product Description

The SOUTHLAND 521-205HN is a 1-inch black iron coupling designed to join two pipes of matching diameter in a secure, leak-resistant connection. Black iron fittings are the standard choice for gas, oil, and fuel piping systems in both residential and commercial settings. This coupling is a threaded fitting that mates with standard NPT pipe ends, making installation straightforward for licensed plumbers, pipefitters, and HVAC technicians. At 0.425 pounds, it is a compact, lightweight component suited for tight mechanical rooms, utility spaces, and inline pipe runs. It is not rated for potable water service.

This coupling is appropriate for use in systems transporting LP gas, natural gas, lubricating oil, grease, and fuel lines. It is commonly installed in residential gas distribution piping, commercial HVAC fuel supply lines, and light industrial lubrication systems. Plumbers and pipefitters also use black iron couplings in custom fabricated pipe assemblies and DIY mechanical projects where a durable, heat-tolerant iron fitting is required. The 1-inch size suits a wide range of mid-capacity pipe runs in typical trade applications.

Key Features

• 1-inch black iron construction for use in gas, oil, grease, and fuel piping systems
• Threaded ends mate with standard NPT pipe for a secure, leak-resistant connection
• Joins two pipes of matching diameter inline without reducing flow path
• Lightweight at 0.425 pounds, suitable for confined or overhead installations
• Not rated for potable water — appropriate for non-water fluid and gas service only

Compatibility

Designed as an OEM-style black iron threaded coupling for 1-inch NPT pipe in gas, oil, lubricant, and fuel distribution systems. Not intended for potable water applications.

Installation Notes

Installation of gas-line fittings must be performed by a licensed plumber or pipefitter in accordance with local codes and the International Fuel Gas Code (IFGC). Shut off the gas supply and verify zero pressure at the line before making or breaking any threaded connection. Apply an approved thread sealant or PTFE tape rated for gas service to all threaded joints. Pressure-test the completed assembly before returning the system to service.