Amazon.com: FangKingNo 10pcs 3/4" White PVC Pipe End Cap Plug Adapter Pipe Fittings Slip (Socket) SCH40 Easy to Install, and High Tensile for Home or Industrial Use (10 Pack ) (0.75 Inch) :
921344-1 Hex Head Plug: 1/2 in Fitting Pipe Size, Schedule 40, Male NPT, 600 psi, White | Imperial Supplies
Charlotte Pipe Schedule 40 3/4 in. Spigot x 3/4 in. Dia. Slip PVC Plug | Celebration Hardware