Nipple Brass 2 in. x 6 in. MIPT Threaded Both Ends. Matco-Norca began in 1952 as the pioneer in sourcing valves. Since then, Matco-Norca has grown to be one of the largest independent sourcing companies that markets Matco-Norca branded fittings, pipe nipples, valves and plumbing specialties to wholesalers serving contractors and municipalities throughout the USA. Over the years, we established our company as "the" leader in providing quality products with exceptional value and service.