Charlotte Pipe 1/2 in. PVC Schedule 40 S x S Coupling PVC021000600HD - The Home Depot
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
Halex 1/2 in. Rigid Conduit Coupling 64005 - The Home Depot
Value Collection - Malleable Iron Pipe Coupling: 1-1/2″ Fitting - 36990380 - MSC Industrial Supply