B K/mueller Inds(import) 521-800HC Black Pipe Plug

Product Description

The B K/MUELLER INDS(IMPORT) 521-800HC is a black pipe plug sized at 1/8 inch, designed to seal threaded pipe openings in plumbing, gas, and mechanical systems. This fitting is used to cap off unused ports, test points, or dead-end connections in low-pressure piping installations. Its black finish indicates a malleable iron or black steel construction typical of this fitting type, making it suitable for gas line and general industrial applications. Licensed plumbers and pipefitters install this fitting as part of routine rough-in and service work.

This plug is suited for residential and light commercial plumbing and gas piping systems where a 1/8 inch threaded port needs to be sealed. Common applications include capping unused tee outlets, sealing test ports after pressure testing, and closing off branch connections that are not in service. The plug ships in a package quantity of 25 units, making it practical for contractors stocking fittings for multiple jobs.

Key Features

• 1/8 inch threaded pipe plug for sealing unused threaded ports
• Black finish consistent with gas-rated pipe fitting applications
• Sold in a package quantity of 25 units for jobsite convenience
• Compact and lightweight at 0.52 pounds per package
• Standard threaded design for straightforward installation with a pipe wrench or hex key

Compatibility

Designed as an OEM-style replacement or standard stock fitting compatible with 1/8 inch NPT threaded pipe connections in plumbing and gas piping systems.

Installation Notes

Installation of pipe plugs on gas lines must be performed by a licensed plumber or gas fitter in accordance with local codes and the International Fuel Gas Code (IFGC). Shut off the gas supply and relieve system pressure before installing or removing any pipe plug. Apply an appropriate thread sealant or PTFE tape rated for the service type prior to installation. Do not overtighten, as this can crack fittings or damage threaded ports.