Amazon.com: Brass Pipe to Hose Fitting,1/2 NPT male X 3/4 Hose Thread Female,Garden Hose Fitting to Pipe Fittings Connector Adapter 3pcs with Extra Rubber Washer 6pcs (1/2NPT male to 3/4 GHT female) :
Apollo 1/2-in Threaded Drip Irrigation Female Adapter in the Drip Irrigation Fittings department at Lowes.com