Halex 2 in. Rigid Conduit Coupling 64020 - 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