B K/mueller Inds(import) 521-206HN Black Pipe Coupling 1-1/4 in

Product Description

The B K/MUELLER INDS(IMPORT) 521-206HN is a black right-hand threaded pipe coupling designed for joining sections of black iron pipe in gas, mechanical, and industrial piping systems. At 1-1/4 inches, this fitting accommodates standard Schedule 40 black pipe and is sold in a package of five units. The right-hand thread pattern conforms to standard NPT engagement, providing a secure, leak-resistant connection when properly fitted and sealed. Licensed plumbers, pipefitters, and mechanical contractors are the typical installers of this type of coupling in both new construction and service work.

This coupling is suited for residential and light commercial piping applications where black iron fittings are required, including natural gas distribution lines, propane systems, and general mechanical piping. The 1-1/4 inch size is commonly found in branch and main supply lines where moderate flow capacity is needed. The five-piece pack quantity supports service trucks and job-site inventory for contractors handling multiple fittings per job.

Key Features

• 1-1/4 inch right-hand NPT threaded coupling for standard black iron pipe
• Black iron construction for use in gas and mechanical piping applications
• Sold in a package of 5 units to support job-site and van inventory needs
• Standard right-hand thread engagement compatible with NPT-threaded black pipe and fittings
• Package weight of 3.27 pounds for the 5-piece pack

Compatibility

Designed as an OEM-style replacement and standard service fitting for 1-1/4 inch black iron pipe systems using right-hand NPT threads.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including the International Fuel Gas Code (IFGC) and International Plumbing Code (IPC) where required. Shut off gas or fluid supply and depressurize the line before disassembling or installing any threaded pipe coupling. Apply an approved pipe thread sealant or PTFE tape rated for the intended service medium to the male threads before engagement. Do not over-tighten; use a pipe wrench and backup wrench to prevent stress on adjacent fittings or pipe sections.