Amazon.com: Vacuum Cleaner Adapter 35mm (1-3/8 Inch) to 31 mm (1-1/4 Inch) for Inner Diameter 32 mm Brush Fit to Outer Diameter 35 mm Tube Plastic Vacuum Hose Adapter(2 Pieces): Home & Kitchen
2-1/2" Wet/Dry Vacuum Hose Coupling at Menards®
Hose to Hose Connector Both Ends Threaded – Manufacturer of VacuMaid Central Vacuum Systems
Amazon.com : ATIE 1.5" Pool Cleaner Hose and Vacuum Hose Connector Adapter AXV092 Replacement for Hayward AXV092 Automatic Pool Cleaner Hose Connector : Patio, Lawn & Garden
RIDGID Hose and Accessory Adapter Kit for RIDGID Wet/Dry Shop Vacuums VT1755 - The Home Depot
2.5 inch Rigid Plastic Vacuum Hose Connector Fitting | Oneida Air Systems
Vacuum Hose Connector – One End Threaded – VacuMaid Garage Vac