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The Mueller Industries 521-352 is a black iron reducing coupling designed for connecting two female-threaded pipes with different diameters. This coupling is ideal for various applications including lubricant, oil, grease, liquefied petroleum (LP) gas, natural gases, steam, and diesel. Constructed from malleable iron, it provides a secure and lasting seal.
This coupling ensures compliance with ANSI/ASME B1.20.1 standards, making it a reliable choice for professionals.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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