B K Mueller 511-801HN 1/4 Inch Galvanized Pipe Plug 25 Pack

Product Description

The B K Mueller Industries 511-801HN is a 1/4-inch galvanized pipe plug designed to seal threaded pipe openings in plumbing, HVAC, and gas piping systems. Manufactured using a plain forged construction, this plug delivers consistent thread engagement and reliable pressure-holding capability in low- to moderate-pressure applications. The hot-dip galvanized finish provides corrosion resistance in exposed or damp environments. This plug ships in a package quantity of 25 units, making it suitable for stocking a service van or shop inventory. Plumbers, pipefitters, and HVAC technicians install these plugs during system testing, capping unused ports, or completing rough-in work.

This plug is used in residential and light commercial piping applications where a threaded male plug is needed to close off a female-threaded fitting or pipe end. Common applications include capping test ports, sealing unused branch connections, and plugging open ends during pressure testing of water, air, or gas lines. The 1/4-inch size fits standard NPT-threaded fittings of the same nominal diameter.

Key Features

• Plain forged construction for consistent thread form and mechanical strength
• Galvanized finish for corrosion resistance in wet or exposed environments
• 1/4-inch nominal size fits standard 1/4-inch NPT female-threaded fittings
• Sold in a package of 25 units for shop or van stocking
• Suitable for sealing unused ports, capping branch lines, and pressure testing

Compatibility

Designed as a standard 1/4-inch male NPT pipe plug for use with compatible female NPT-threaded fittings and pipe ends in water, air, and gas piping systems.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable IPC or IFGC requirements for the system type. Apply an appropriate thread sealant or PTFE tape to the male threads before installation. Do not overtighten, as this can crack female fittings, particularly those made of cast iron or plastic. Always depressurize and isolate the pipe section before removing or installing threaded plugs.