Bk 521-407BG Malleable Black Iron Pipe Cap 1-1/2 in

Product Description

The BK 521-407BG is a 1-1/2 inch malleable black iron pipe cap used to close off the end of a threaded pipe run. Manufactured to meet ANSI/ASTM A-197 material standards, with threads conforming to ANSI B1.20.1 and dimensions per ANSI/ASME B16.3, B16.14, and B16.39. Each fitting is individually flag tagged and 100% inspected and quality tested before shipment. This cap is a standard component in gas, plumbing, and HVAC piping systems where a clean, pressure-rated pipe termination is required. Licensed plumbers, pipefitters, and HVAC technicians are the typical installers.

The 521-407BG is suited for use in residential and light commercial piping applications involving black iron pipe systems. Common use cases include capping gas supply lines, closing unused branch outlets, and pressure-testing pipe assemblies. At 1-1/2 inch, it fits standard NPT-threaded black iron pipe of that size. The Mueller logo is cast into the body of each fitting, indicating the manufacturing source behind this BK-distributed product.

Key Features

• Malleable black iron construction meets ANSI/ASTM A-197 material specification
• Threads conform to ANSI B1.20.1 for reliable NPT engagement
• Dimensions per ANSI/ASME B16.3, B16.14, and B16.39
• Individually flag tagged and 100% inspected and quality tested
• Mueller logo cast into fitting body
• Sold individually (each)

Compatibility

Designed as a standard NPT threaded cap for 1-1/2 inch black iron pipe systems used in gas, plumbing, and HVAC piping applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, the IFGC, or the IPC as relevant to the service. Shut off gas or water supply and depressurize the line before fitting installation. Apply appropriate thread sealant or pipe tape rated for the service medium before threading the cap onto the pipe. Do not over-tighten; hand-snug then finish with a pipe wrench to avoid cracking the fitting.

Technical Specifications

• Size: 1-1/2 inches
• Material: Malleable Black Iron
• Material Standard: ANSI/ASTM A-197
• Dimensional Standard: ANSI/ASME B16.3, B16.14, B16.39
• Thread Standard: ANSI B1.20.1
• Weight: 0.465 pounds
• Unit of Measure: Each

Standard Information

• Brand: BK
• Manufacturer Part Number: 521-407BG