Canplas 193026 PVC DWV Reducer Coupling, 3 x 4-Inch, White - Pipe Fittings - Amazon.com
3" X 2" Galvanized Bell Reducing Coupling NPT Thread | PRM
3 inch PVC DWV x Cast Iron Adapter Coupling, DWV Spigot x Cast Iron No Hub | Buy DWV Couplings & More at Southern Pipe & Supply
Amazon.com: Squirrelly 4" to 3" Inch Black Silicone Reducer Coupler 3 Layers of Polyester Reinforcement Suitable High Level Turbo Pipe with 2x T-Bolt Clamps : Automotive
1" x 3/4" FIP Stainless Steel Pipe Reducer Coupling at Menards®
NDS PVC S&D Increaser/Reducer Coupling, 3 in. Hub X 4 in. Hub 4P07 - The Home Depot
SharkBite 1 Inch x 3/4 Inch Reducing Coupling, Push to Connect Brass Plumbing Fitting, PEX Pipe, Copper, CPVC, PE-RT, HDPE, U060LFA - Pipe Fittings - Amazon.com
PVC Reducer Coupling - Schedule 40 - White - Socket x Socket - 1-1/2" to 3/4" (120/Cs) | Fittings N' Valves