4" flex hose and pvc fitting connection

[chocdog]

I am about to build my separator lid and I have a couple of questions about the connections between the inlet/outlet points and my flex hoses.
Am I missing something? The id of the flex hoses is 4" and the od of the fittings are 4.15" to 4.25".How are you making these connections.  After reading "here's the plans" several times and scouring the forum I have not seen anyone discussing this.  Please explain what all you have done to address this.
Thanks in advance.

[tvman44]

I purchased adapters to go from 4" PVC to flex hose.

[chocdog]

Thanks.
I found what I was looking for.
I am using 4" sd long rad elbow, 4" sd pipe nipple and a 4" sd x 3" pvc adapter.  Adapter measures about 3 7/8" od.
Picked up all my materials and will build it tomorrow.  Can't wait to see how it works.