B K/mueller Inds(import) 521-807HN Black Plug 1.5in

Product Description

The B K/MUELLER INDS(IMPORT) 521-807HN is a black plain plug designed to cap or close off pipe openings in plumbing and piping systems. This type of plug threads directly into a female-threaded fitting or pipe end, providing a secure, leak-resistant closure. At 1-1/2 inches, it suits standard pipe sizes common in residential and light commercial installations. Plumbers and pipefitters install this plug to terminate unused branch lines, isolate sections during pressure testing, or seal off ports during system maintenance. The black finish indicates a malleable iron or black iron construction typical for gas, air, and water piping applications.

This plug is suited for use in pipe systems requiring a threaded male plug at the 1-1/2 inch nominal pipe size. Typical applications include capping open tees, crosses, or couplings in black iron gas lines, compressed air distribution, and general industrial or residential piping. It is packaged in a quantity of four units per package, making it practical for jobs requiring multiple closures in a single visit.

Key Features

• 1-1/2 inch nominal size fits standard female-threaded pipe fittings
• Black finish consistent with black iron pipe fittings for gas and air systems
• Plain plug design provides a clean, flush closure on open pipe ends
• Sold in a package quantity of four units
• Threaded male configuration for direct engagement with female-threaded fittings or pipe ends

Compatibility

Designed as an OEM-style replacement or standard-use fitting for 1-1/2 inch female-threaded pipe connections in black iron piping systems.

Installation Notes

Installation is performed by a licensed plumber or pipefitter following applicable code requirements such as IFGC or IPC depending on the service. Shut off all gas or fluid supply and depressurize the system before installing or removing any threaded plug. Apply appropriate thread sealant or tape to the male threads before installation. Do not over-tighten; hand-tighten and use a pipe wrench for final seating without stressing the fitting or connected pipe.