Need to add a threaded port to your aluminum pipe or tank? This 1-1/2 inch NPT half coupling is perfect for the job. It's machined from 6061-T6 aluminum, which is strong, weldable, and corrosion-resistant. The 'half coupling' means it's like a short nipple with female threads on one end and a plain surface on the other – you weld the plain end onto your project, and then you can screw a pipe, valve, or gauge into the threaded side. It's a standard Schedule 40 fitting. Part number A090841 from MVF, Inc., and it's made right here in the USA. Great for custom fabrication projects in automotive, aerospace, plumbing, or anywhere you need a durable, threaded connection in an aluminum system. Brand new and ready for your workshop.