B K/mueller Inds(import) 521-804HN Black Plain Plug

Product Description

The B K/MUELLER INDS(IMPORT) 521-804HN is a 3/4-inch black plain plug designed to cap or seal threaded pipe openings in gas, air, and fluid piping systems. This fitting provides a secure, leak-resistant closure on male-threaded pipe ends. Sold in a package of 20 units, it is well suited for contractors and service technicians who install or maintain black iron piping systems in residential and light commercial applications. The plain plug style allows for straightforward installation without the need for specialized tooling beyond a pipe wrench.

This plug is a standard fitting used in gas distribution piping, compressed air lines, and general plumbing rough-in work. It is commonly installed by licensed plumbers, HVAC technicians, and pipefitters when capping unused branch outlets, test ports, or service connections. The 3/4-inch size is one of the most common pipe sizes encountered in residential gas and air systems, making this a practical item for field stock.

Key Features

• 3/4-inch pipe size for use on standard threaded pipe
• Black finish consistent with black iron pipe systems
• Plain plug style for straightforward threaded installation
• Sold in a package of 20 units, suitable for contractor stocking
• Compact and lightweight at approximately 2.47 pounds per package

Compatibility

Designed as a standard threaded pipe plug for use with 3/4-inch black iron or steel pipe systems in gas, air, and general fluid piping applications.

Installation Notes

Installation is performed by licensed plumbers or HVAC technicians working on threaded pipe systems. Shut off all gas or fluid supply and depressurize the line before removing or installing any threaded fitting. Use an appropriate pipe wrench and apply thread sealant or tape in accordance with local code requirements and IFGC or IPC guidelines. Do not over-tighten threaded fittings, as this can damage the threads or the fitting body.