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The B K/MUELLER INDS(IMPORT) 511-401HN is a 1/4 inch galvanized pipe cap used to close off the end of a threaded pipe. The hot-dip galvanized coating provides corrosion resistance suited to water supply, gas distribution, and general piping systems. This cap threads directly onto a male-threaded pipe end, creating a secure, sealed termination. It is installed by licensed plumbers and pipefitters in both residential and light commercial applications where a threaded steel fitting is required to cap an unused or temporarily inactive line.
This cap is well suited for water supply and gas piping rough-in work where branch lines need to be temporarily or permanently capped. It fits standard 1/4 inch NPT male-threaded pipe ends and is commonly used during pressure testing, system modifications, or permanent line termination. The galvanized finish makes it appropriate for damp or exposed environments where bare steel would be at risk of surface corrosion.
Designed as an OEM-style replacement and standard threaded fitting for use with 1/4 inch NPT male-threaded galvanized or black steel pipe in residential and commercial plumbing and gas piping systems.
Installation is performed by a licensed plumber or pipefitter in accordance with applicable IPC or IFGC requirements. Shut off and depressurize the line before threading on the cap. Apply thread sealant tape or pipe dope rated for the service type prior to installation. Do not overtighten, as this can damage the threads on the pipe end.
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