The Maxi-paw side inlet is a 1/2" connection. You didn't say with what you are replacing the Maxi-Paw..?? (Personally, I'm replacing all of mine with Hunter PGP rotors.) I would use swing pipe (also called funny pipe) to make the connection. Look for it at sprinklerwarehouse.com under the "Fittings" menu on the home page (you'll see Swing Pipe and Swing Pipe Fittings on that menu). You can see Maxi-Paw installation instructions at http://www.sprinklerwarehouse.com/manuals/Rainbird/Rotors/man_AG5_Maxipaw.pdf and tech. specs at http://www.sprinklerwarehouse.com/manuals/Rainbird/Rotors/ts_Maxi-Paw.pdf
