Fantastic! Thanks! I was able to find online when I added Polaris. Strangely Pentair has no such part for the Legend or Legend II that I can find anywhere. Even more strange, they do have exactly the same part listed as "pentair replacement part for Polaris Pool Cleaner" see
http://www.pentairpool.com/pool-pro/partslists/cleaners-pentair-replacement-parts-for-polaris-pentair-polaris-cross-reference-replacement-parts-141.htm

Their tech support knows nothing of this however...

Thanks ton - I was considering using a mallet and cold chisel to tear out the 3/4 inch fitting and repipe - which could only end badly!