If you're working on plumbing, compressed air systems, or any pipe project, this 66-piece brass fittings assortment is exactly what you need to have on hand. You get a complete selection including male hex head plugs, male to female adapters, hex bushings, female couplings, and male hex nipples in all the most common sizes - 1/8\, 1/4\, 3/8\, and 1/2\ NPT threads. The CA360 forged brass construction is seriously durable and corrosion-resistant, with deep, accurate threads that create tight, leak-proof connections. These fittings can handle up to 1200 PSI and temperatures from -65°F to +250°F, making them perfect for plumbing, hydraulic systems, compressed air, instrumentation, and gas applications (though not for drinking water). The hex design makes installation easy with standard wrenches, and the NPT tapered threads provide better sealing than straight threads. I'd still recommend using a little Teflon tape for extra security against leaks. Having this comprehensive kit means you'll always have the right fitting for repairs or new installations without running to the hardware store mid-project!