Amazon.com: 304 Metal Stainless Steel Pipe Fitting, Coupling, Npt 1/2 x Npt 1/2 Inch Female Pipe 1 Piece : Industrial & Scientific
Charlotte Pipe 1/2 in. PVC Schedule 40 S x S Coupling PVC021000600HD - The Home Depot
20 Pack 1/2" PVC Pipe Coupling Adapter Pipe Fitting Connector (Socket x Socket), Furniture Build Grade SCH40 1/2 Inch PVC Pipe Slip Socket Connectors for Home or Industrial Use, White - Amazon.com
Amazon.com: FangKingNo10pcs 1/2" White PVC Pipe Coupling Adapter Pipe Fittings (Slip to Slip) Schedule 40 Easy to Install,and High Tensile for Home or Industrial Use (1 Pack of 10pcs) : Industrial &
RELIABILT 2-in Black Coupling in the Black Pipe & Fittings department at Lowes.com
Aluminum, 1/2 in x 1/2 in Fitting Pipe Size, Straight Coupling - 60PV88|ZUSA-PF-9382 - Grainger