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The B K/MUELLER INDS(IMPORT) 511-403HN is a 1/2 inch galvanized steel pipe cap used to terminate or seal the end of a threaded pipe run. It threads onto a male-threaded pipe end, blocking flow and protecting the pipe opening from debris, moisture, and corrosion. This cap is sold in a 25-unit pack, making it a practical stocking item for plumbing contractors, pipefitters, and HVAC technicians who routinely cap off unused branch lines, test ports, or temporary service points. The galvanized finish provides corrosion resistance suited to both interior and exposed service environments.
This pipe cap is appropriate for use in residential and light commercial plumbing systems where 1/2 inch NPT-threaded pipe termination is required. Common install scenarios include capping unused gas or water supply stubs, sealing pressure-test ports after inspection, and closing off branch lines during phased construction. The 25-pack quantity is well suited for service vans, wholesale restocking, and multi-unit job sites where this size is frequently consumed.
Designed as an OEM-style replacement and standard-fitment cap for 1/2 inch NPT-threaded pipe ends in residential and commercial plumbing and HVAC piping systems.
Pipe caps of this type are installed by licensed plumbers or HVAC technicians. Always shut off and depressurize the pipe system before threading on or removing any cap. Apply thread sealant tape or compound appropriate to the service medium before installation. Follow applicable IPC or IFGC code requirements for pipe termination and pressure testing in your jurisdiction.
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