B K/mueller Inds(import) 521-407HN Black Pipe Cap

Product Description

The B K/MUELLER INDS(IMPORT) 521-407HN is a black pipe cap sized for 1.5-inch pipe. Pipe caps thread onto the open end of a pipe to seal it, blocking flow and protecting threads from damage or contamination. This cap is a standard fitting used in gas piping, compressed air, and general plumbing rough-in work where a threaded pipe end needs to be closed off temporarily or permanently. It is installed by licensed plumbers, pipefitters, and HVAC technicians during system assembly, pressure testing, or when capping off unused branch lines.

This pipe cap is suited for residential and light commercial piping applications. It is commonly used on black steel pipe runs in gas distribution systems, as well as in industrial fluid and air supply lines. The 1.5-inch size is a frequent fit for branch lines and header terminations. This SKU is sold in a package of 5 units, making it practical for jobs requiring multiple caps at once.

Key Features

• Threaded cap design seals 1.5-inch pipe ends securely
• Black pipe finish suitable for gas and general plumbing applications
• Sold in a package of 5 units per SKU
• Standard threaded connection compatible with NPT pipe systems

Compatibility

Designed as an OEM-style replacement fitting for standard 1.5-inch threaded black steel pipe systems in residential and commercial plumbing and gas piping applications.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, IFGC requirements for gas systems, or IPC requirements for plumbing systems. Shut off and depressurize the supply line fully before installing or removing any threaded pipe fitting. Apply an approved thread sealant or PTFE tape to male threads before threading on the cap. Do not overtighten; use a pipe wrench with appropriate leverage for the fitting size and confirm no leaks after pressurizing the system.