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The B K/MUELLER INDS(IMPORT) 511-225HC is a 1-inch galvanized merchant coupling designed to join threaded steel pipe in standard plumbing and mechanical piping systems. The fitting is threaded end to end, allowing it to connect two sections of male-threaded pipe without requiring solder or press tooling. The galvanized steel construction provides corrosion resistance suited to water supply, gas distribution, and general mechanical applications. Licensed plumbers and pipefitters are the primary installers of this fitting in both new construction and retrofit work.
This coupling is used in residential and light commercial piping systems where 1-inch galvanized steel pipe is the specified material. Common applications include water supply mains, gas branch lines, and industrial mechanical runs where threaded galvanized pipe is required by code or by existing system design. The fitting ships in a package quantity of 40 units, making it practical for contractors stocking a job site or restocking a service van.
Designed as an OEM-style replacement and standard-stock fitting for 1-inch NPT threaded galvanized steel pipe systems in residential and commercial mechanical applications.
Installation is performed by a licensed plumber or pipefitter. Shut off the water or gas supply and depressurize the line before threading any fitting. Apply an appropriate thread sealant or PTFE tape to male threads per local code requirements, referencing IPC or IFGC as applicable. Do not over-tighten; use a pipe wrench with a backup wrench on the adjoining pipe to avoid stressing upstream joints.
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