GARDENA 02906-20 Drip irrigation threaded adapter 26.44 mm (3/4") OT, M22 IT | Conrad.com
Amazon.com : Gardena 36004 5 Piece Quick Connector Starter Set, for Any 5/8 Inch or 1/2 Inch Garden Hose, Sprinkler or Spray Nozzle, Made in Germany (Inner Product Color May Vary) :
CRAFTSMAN 1/2-in to 3/4-in Socket Adapter in the Socket Adapters department at Lowes.com