1/4" x 3" Black Steel Pipe Nipple – Threaded NPT Fitting (B&K 1K043)This 1/4" x 3" Black Steel Pipe Nipple is a durable, threaded NPT fitting designed for gas, air, and water piping applications. Manufactured by B AND K LLC, this black steel nipple provides a strong, corrosion-resistant connection for both residential and commercial plumbing and HVAC installations.The nipple features male NPT threads on both ends, making it ideal for extending gas piping runs, joining fittings, or creating custom pipe assemblies in low-pressure fuel gas and mechanical systems.Key Features1/4" × 3" black steel pipe nippleStandard NPT threaded ends (M × M)Suitable for LP gas, natural gas, and propane systemsHeavy-duty black steel constructionCorrosion-resistant finishFits furnaces, heaters, boilers, regulators & manifoldsTypical ApplicationsGas line extension or modificationHydronic heating systemsLow-pressure air or water serviceHVAC and mechanical system installationsPlumbing retrofits and custom pipe assembliesThis universal black steel nipple is a staple component for contractors, plumbers, and installers who require reliable NPT-threaded connections in gas and hydronic systems.

Important Notice – Propane Parts, Accessories, and Regulators

This product, including but not limited to propane parts, accessories, fittings, hoses, valves, and regulators, must be installed and serviced by a licensed professional in accordance with all applicable local, state, and federal codes, regulations, and standards.

The seller assumes no responsibility for the installation, inspection, application, maintenance, or use of this product.

It is the sole responsibility of the buyer to ensure the product is appropriate for their intended application and that it is installed correctly by a qualified individual.

Improper installation, maintenance, or use of propane products may result in serious injury, death, fire, explosion, or property damage.

The buyer accepts all risks, liabilities, and potential consequences associated with the use of this product.

By purchasing this item, the buyer acknowledges that they have read, understood, and agreed to these terms and confirm that installation and use will be conducted by a properly licensed and qualified professional.


The B&K 1K043 Black Steel Pipe Nipple is a durable, precision-threaded pipe fitting designed for use in natural gas, propane (LP), water, compressed air, HVAC, and other non-corrosive piping systems. Measuring 1/4" NPT x 3" with male threads on both ends, this fitting provides a secure, leak-resistant connection for residential, commercial, and industrial installations.

Constructed from high-quality black steel, the pipe nipple is engineered for strength, durability, and long service life. Precision-cut NPT threads ensure compatibility with standard threaded fittings and make installation quick and reliable.

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