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Irrigation - Pipe Adapter Half Inch

1/2 in. PVC Barb x MPT Insert Male Adapter

Pipe Adapter Half Inch MNPT 

http://www.homedepot.com/p/Orbit-1-2-in-PVC-Barb-x-MPT-Insert-Male-Adapter-1436005RMC/203003473?keyword=1%2F2%22+POLY+INSRT+MALE+ADPTR+IXMPT         $0.33

These are a bigger diameter into the 1/2" hose than the ones officially sold for the irrigation pipe, so are a more reliable connection.