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Private: 12mm Double End Connector
Double Female Hose Connector | Hose Fittings - Ladco Australia
Amazon.com : Tatuo 6 Pack Garden Hose Connector Adapter, Male to Male, Female to Female, Hose End Cap, 3/4 Inch Connector Extra 10 Pack Washers : Patio, Lawn & Garden
Amazon.com : ZKZX Brass Garden Hose Double Female End Connect Adapter Double Female Quick Connector Thread Size 3/4" x 3/4" Pipe,Connect Male to Male End,3 Pieces with Extra 6 Washers (3Female) :