Cobra Products 331 Drain SMALL BLADDER

I don't have a screw fitting on the end of my hose. I have a click on system. Do you sell the attachment so I can use the click hose still? Thankyou

Can you use this at a cleanout, or do you have to put it into the sink drain?

is bladder flexible to manage curves in 3-4 inch corrugated drain pipe?

What is the diameter of the bladder?