It is a three-part device, and is one of the most popular and commonly-used type of fitting in the industry for one simple reason: brass fittings are used to attach the ends of two incompatible tubes or pipe together, such as a copper and a PVC pipe.3.A compression fitting is a crucial and indispensable element of your home, your life.4. Holding the crescent wrench steadily in one hand, turn the other crescent wrench towards the right to tighten the compression nut and brass fitting together, compressing the ring onto the copper tube and create a permanent bond.. Heres a step-by-step instruction guide to help you out.If you want to install or else fix a leaking brass fitting on your water line, you better know what youre doing.How do you think water gets to your kitchen sink all the way from the community water tank supply? How does the plumbing control water flow to the comfort room, or to the kitchen sink, or both at the same time? Why is your unemployed neighbor so keen on fixing your water line leak for you?Because its easy. Then slide both the compression nut and compression ring towards the fitting.5. You dont see or hear about it every day. Simply put brass compression fittings arent as robust as the soldered fitting type. Thats something you dont hear every day. Brass compression fittings are as flexible, just about, as any type of fitting could be. But its there, making life more convenient, without you knowing it. Brass compression fittings make everything about plumbing easy. This effectively seals the brass fitting into place. Turn the water back on and check for leaks.First, the basics. Slide the compression nut, one piece of the brass fitting, over one end of the copper tube followed by the compression ring, the second piece.2. The usual complaint about brass fittings is their being susceptible to permanent damage and leaks even from the smallest movement. A compression fitting is a simple tool used in electrical conduit systems as well as basic household plumbing to connect two tubes or pipes together. Take a piece of emory cloth and use it to clean the end of the copper Detergent Container tube. Slide the compression fitting slowly into the open end of the copper tube.What you need: Compression fitting Two crescent wrenches Emory cloth Plumbing thread Sealant (optional)Instructions:1. If everything stays dry, give yourself a pat on the back for a job well done!Brass fittings are common for household water lines but it doesnt mean they dont have their disadvantages. There are two types: the standard fitting that require no modification and common in compressed air and water connections, and the flare fittings that require modifications and used in high pressure gas lines. Use two crescent wrenches to fit the compression nut and brass fitting. Both types of brass compression fittings are used in household and industrial settings.But every sad story has its surprise twist ending