Quick disconnect for 120mm port and 5" flex duct

[mark mcfarlane]

Mark, it's the double ended Fernco used to "flexibly" join cast iron soil pipes which have an exterior diameter that approximates the 120mm you need. The inside diameter slips easily over the 120mm port and yes, the 5" flex pipe clamps over the outside of the rubber part. I bought mine at Home Depot.

Thanks Jim.