Brennan is a manufacturing company based in the United States, specializing in building materials. Established in 1953, the company has grown to employ between 201 and 500 individuals and reports a revenue of approximately $135 million. Brennan's expertise is highlighted in its published document, a "Thread Identification & Measurement Guide," which serves as a resource for accurately identifying and measuring fluid line connectors. This guide outlines essential methods for measuring thread diameters using specific tools such as combination O.D./I.D. calipers and thread pitch gauges, emphasizing the importance of precise measurements for selecting and installing appropriate fittings in hydraulic fluid transfer and piping systems. The guide also addresses potential challenges related to worn connectors and provides insights into various thread types, including BSPP and NPSM connections. Through this documentation, Brennan demonstrates its commitment to providing detailed technical guidance in the manufacturing sector, particularly within the context of building materials and fluid connection systems.