Well there are fittings very similar to these used on plastic tubing in pneumatics... you push the tube in, and it stays there, until you press the rim piece and yank the tube out... quite like pulling it apart. Don't know if that is applied to water plumbing, I always used these compression fittings if I need to alter plumbing, and they're sold as the default thing if anyone "non-pro" goes to buy plumbing stuff. they're quite nice because I don't need to carry the brazing torch or acetylene welding gear etc, or use any very special tools but two wrenches... can do it in a prone-to-burn area, and places where I have no room to rest my bloodshot peepers on the object of work (when both my hands are already in, and the third one would be, had I developed it).
Have you seen the fittings sold here as "Sharkbite"
Don't exactly know what this means?? B)
Keino, anything like that make it's way to the "swamp"?