I wasn't referring to something like a Sharkbite, although they do make a slip coupling that would work. I'm not sure if they make the equivalent in CPVC, but on copper, a repair coupling looks identical to a normal coupling, but there is no center stop. You have to work fast since you need to slobber it up with the cement, slide it over the end, put the new piece in there, then slide it back before the cement hardens. The Sharkbite fitting is fairly long, and has one 'normal' push on fitting with a stop, and the other side is quite a bit longer and seals near the end...the pipe can slide in quite a ways, so you can slide it past where you need it, then push it back into the fixed pipe once you get it there.