HydroMaxx 1-1/4-in Schedule 40 PVC Straight Coupling Conduit Fittings (50-Pack) in the Conduit Fittings department at Lowes.com
Watts ANKA 1-1/4 in. x 1-1/4 in. Fiberglass Reinforced Nylon Straight Coupling ASC114 - The Home Depot
Keeney 1-1/4-in Plastic Straight Coupling in the Under Sink Plumbing department at Lowes.com
Charlotte Pipe 1-1/4 in. PVC Schedule 40 S x S Coupling PVC021001200HD - The Home Depot
Poly Pex-A Expansion Coupling 1-1/4" x 1" F1960 Poly-Alloy Fitting, 1-1/4 Inch x 1 Inch Expansion Barb Connections, Straight Coupling for Plastic Tubing for use with Pex-A Tubing - Amazon.com
Plumb Pak 46WK Extension Coupling, 1-1/2-Inch or 1-1/4-Inch by 1-1/2-Inch, White - Pipe Fittings - Amazon.com
Amazon.com: Brass Ball Valve Shut Off Switch, Tubing Fitting Straight Coupling Adapter 2pcs (1/4" NPT Male x 1/4" NPT Female) : Industrial & Scientific