FerncoP1070-44 Flex Coupling, Black, x 4 Inches

Great product

I had tried several ways to hook the outlet of my sump pump to corrugated tubing and it always leaked. Thus much of the water water ran right back Into the basement. This fitting did the trick! It's a tight fit to get on but with a little twisting all was good. This should work well in the winter. If I ran the PVC pipe away from the house it freezes. The corrugated tube is large enough that it doesn't freeze but it's hard to connect to the sump. Now I ran PVC to just outside the basement wall then stepped up to 4" PCV then this fitting allowed me to seal on the 4" corrugated tube. Amazing job.

worked very well, very well built and durable. I did have to cut the lip off that was on the inside of the field tile side, I could not get it to go on the tile otherwise. Didn't seem to make any difference as far as sealing around the tile.

Good tight seal. Will need pliers to get the corrugated pulled up into coupling. Better than the other internal coupler I tried in terms of strength.

Needed to join some corrugated pipe to rigid PVC pipe as part of my ongoing French drain construction and could not find the couplings in my local store. Ordered online without a problem and delivered couple of days later.Product is rigid but had some flexibility so easy to install. The worm drive clips ease installation and sealing