B K Mueller 511-204HN 3/4 Inch Galvanized Coupling with Stop

Product Description

The B K Mueller Industries 511-204HN is a 3/4-inch galvanized steel coupling with an internal stop, designed for use in threaded pipe assemblies across plumbing and light mechanical applications. The internal stop positions pipe ends at the center of the fitting to ensure consistent joint depth during assembly. The galvanized finish provides corrosion resistance suited to water supply and general-purpose piping systems. This fitting ships in a package quantity of 20 units, making it practical for contractors and service techs stocking job-site supply. Licensed plumbers and pipefitters are the primary installers for this type of threaded coupling.

The 511-204HN is suited for residential and light commercial plumbing installations where threaded galvanized pipe connections are required. Common applications include water supply distribution, general-purpose pipe repairs, and replacement of worn or damaged couplings in existing galvanized systems. The built-in stop prevents over-insertion, helping to maintain proper thread engagement and a leak-free joint. The 20-unit pack is appropriate for multi-fixture rough-in work or supply house restocking.

Key Features

• Internal stop centers pipe ends for consistent insertion depth and proper thread engagement
• Galvanized finish resists corrosion in water supply and general plumbing environments
• 3/4-inch nominal pipe size fits standard NPT-threaded galvanized pipe
• Sold in a 20-unit package, reducing per-unit cost for multi-piece jobs
• Threaded connection requires no special tooling beyond a pipe wrench and thread sealant

Compatibility

Designed as an OEM-style replacement coupling for standard 3/4-inch NPT threaded galvanized pipe systems in residential and commercial plumbing applications.

Installation Notes

Installation of threaded galvanized couplings should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC requirements. Shut off the water supply and relieve line pressure before removing any existing fittings. Apply pipe thread sealant or PTFE tape to male threads before assembly, and tighten with a pipe wrench to proper engagement — do not over-torque, as this can crack the fitting or damage threads. Inspect the joint for leaks after restoring system pressure.