Bk 521-806BG Black Iron Pipe Plug 1-1/4 in

Product Description

The BK 521-806BG is a 1-1/4-inch malleable black iron pipe plug designed to seal threaded pipe ends in gas, oil, and industrial piping systems. Manufactured from black malleable iron conforming to ANSI/ASTM A-197, each plug features NPT threads cut to ANSI B1.20.1 standards and dimensions meeting ANSI/ASME B16.14 and B16.39. The fitting is individually flag tagged, 100% inspected, and quality tested before leaving the factory. The Mueller logo is cast into the body of each fitting as a mark of traceability. Plumbers, pipefitters, and HVAC technicians install this plug to cap unused branch outlets or temporarily seal pipe ends during system testing and service.

This pipe plug is suited for residential and commercial plumbing, gas distribution, and industrial piping applications where a threaded iron plug is required to close off a female-threaded fitting or pipe end. Its malleable iron construction makes it appropriate for systems requiring moderate mechanical strength and vibration resistance. It is sold individually and is well suited for service calls, retrofit work, or new construction where standard black iron fittings are specified.

Key Features

• Malleable black iron construction meets ANSI/ASTM A-197 material specification
• Threads conform to ANSI B1.20.1 for reliable sealing on standard NPT fittings
• Dimensions comply with ANSI/ASME B16.14 and B16.39
• 100% inspected and quality tested at the factory
• Individually flag tagged for easy identification at the job site
• Mueller logo cast into fitting body for product traceability

Compatibility

Designed as an OEM-style replacement or standard service fitting compatible with 1-1/4-inch female NPT threaded pipe and fittings in black iron piping systems.

Installation Notes

This fitting is installed by licensed plumbers or pipefitters working on threaded iron pipe systems. Shut off and depressurize the line before removing or installing any threaded pipe plug. Apply an appropriate thread sealant or PTFE tape to the male threads before installation, and tighten using a pipe wrench sized for the fitting. Follow local plumbing and gas codes, including applicable IFGC or IPC requirements, for material and joint approval in the intended service environment.

Technical Specifications

• Size: 1-1/4 inches
• Material: Malleable Black Iron
• Material Standard: ANSI/ASTM A-197
• Dimension Standard: ANSI/ASME B16.14, B16.39
• Thread Standard: ANSI B1.20.1
• Weight: 0.334 pounds
• Unit of Measure: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-806BG