3 x 4 Threaded x Groove Schedule 40 Black NippleThe 3 x 4 Threaded x Groove Schedule 40 Black Nipple with one 3" threaded end and one grooved end is designed for piping systems requiring a threaded connection on one side and a grooved coupling on the other. This configuration allows for flexible and quick assembly while maintaining a secure connection, making it ideal for fire protection, HVAC, water distribution, and industrial piping applications. The schedule 40 thickness provides strength and