Hey, Stever,
I'm with "waste". I understand what you're saying but where do you find those couplings? I've never seen them. Even if you "burred out" the pipe stopper of a standard coupling, the coupling is tapered into the center and the pipes would not slide freely within the coupling.
I am familiar with a "repair fitting" which is about 7" long and does slide freely over the pipe. It is threaded and that allows both sides of this "repair fitting" to clamp down tightly onto the existing pipe. It's about 8-10 bucks at home depot.
All that said, it sounds like you're talking about something different. I can't quite picture how it makes a good pvc bond without the coupling being tapered.
And "waste", if you're saying you're leery of those rubber connectors with the O-clamps on each end, you have good reason to be. They are very, very marginal for suction side connectors and I wouldn't consider one for a pressure connection of any type. Drain pipes is the only suitable application, IMHO
Dave S.
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