cbillete,
The SQ nozzles are actually tucked in with the nozzles you get when adding any turf or shrub spray head to the project. Once added, if you click the "Show Components" box in the irrigation manager, you should see them at the bottom of the list. Once you pick the nozzle you wish to place, you should be able to use the Q & E shortcut keys to toggle back and forth between the SQ nozzles.