Looking for connectors for top rails. Mine are a two piece. I've read somewhere they make a one piece snap on kind. Anyone heard of this ?

Can you provide a little more detail?

Something like this? See pix Splash Pool Parts

Found at SplashPool Parts dot com, SplashPool Omega and SuperPool Solar Covers, Ladders and Pump Parts

You could find them at a local dedicated Pool Supplier/Installer... a place like Leslie's might be able to order them.
Check your phone book or google; pool supplies, your home town/State

Sorry, I was thinking Electrical.

That's okay Stratmando, I've never heard of multi-piece connectors for top rails.
Maybe his moniker threw Ya... "bus"-manray ;)