Amazon.com : 5 Pack - Orbit 1/2 Inch Female Thread PVC Coupling for Sprinkler Pipe : Patio, Lawn & Garden
2-1/2 inch x 2 inch PVC Schedule 40 Reducer Coupling - Amazon.com
Rainbow Dream 1/2 Inch PVC Coupling Adapter Pipe Fitting (Socket x Socket) - 15 Pack, White - Amazon.com
1/2 in x 1/2 in Fitting Pipe Size, Schedule 40, Coupling - 22FJ48|429005BC - Grainger
Amazon.com: FangKingNo 10pcs 1/2 Inch White 2-Way PVC Male Adapter Pipe Fittings (Socket x Male Pipe Thread) Coupling with 1/2-Inch Male Thread Schedule 40 -10 Pack (0.5 Inch) : Industrial & Scientific