Here is the adapter that you need to buy:
Fernco 1-1/2 in. x 1-1/4 in. DWV Flexible PVC Coupling P1056-150/125 at The Home Depot -
Fernco 1-1/2 in. x 1-1/4 in. DWV Flexible PVC Coupling-P1056-150/125 - The Home Depot
Put one on each end of the hose. Works perfectly and cost $6 each...
