Halex 3/4 in. Rigid Compression Coupling (2-Pack) 96362 - The Home Depot
Sigma ProConnex 3/4-in Electrical (EMT) Zinc-plated Steel Compression Coupling Conduit Fittings (5-Pack) in the Conduit Fittings department at Lowes.com
Eastman 4-1/8 Inch Long Pattern Compression Coupling, 3/4 Inch IPS, Galvanized Steel, 20564 - Amazon.com
Homewerks Worldwide 3/4 in. PVC Compression Coupling 511-43-34-34H - The Home Depot
Apollo 3/4 in. x 3/4 in. PVC Compression Coupling PVCCOMP34 - The Home Depot
Halex 3/4 in. Electrical Metallic Tube (EMT) Compression Coupling (20-Pack) 62402B - The Home Depot
Compression Coupling 3/4" PE x 3/4" PE | GeoHydro Supply