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The B K/MUELLER INDS(IMPORT) 521-207HN is a black equal coupling designed for joining two sections of pipe of equal diameter. Built for use in piping systems where a straight, same-size connection is required, this coupling provides a secure, leak-resistant joint when properly installed. At 1.5 inches in size and weighing approximately 4.26 pounds per package of 5 units, it is sized for standard residential and light commercial piping applications. Licensed plumbers and pipe fitters are the typical installers of this fitting in both new construction and repair work.
This coupling is suited for use in black iron pipe systems commonly found in gas distribution, industrial fluid lines, and similar applications where black pipe fittings are specified. The equal-coupling design means both ends accept the same pipe diameter, making it a straightforward choice for straight-run connections in these systems. Each package contains 5 units, making it practical for multi-connection jobs or stocking service vehicles.
Designed as an OEM-style replacement fitting for 1.5-inch black iron pipe systems in residential and commercial gas or fluid distribution applications.
Installation should be performed by a licensed plumber or pipefitter in accordance with applicable local codes, including the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) where relevant. Shut off all gas or fluid supply and depressurize the line before removing or installing any fitting. Apply appropriate pipe thread sealant or tape to all threaded connections before assembly. Do not overtighten threaded fittings, as this can damage threads and compromise the joint seal.
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