Here's a problem with a storage tube built in the side of a 5th wheel.
The tube is 4" dia. and a Rhino Flex is hose 4 1/4" dia.
Picked up a new door assembly from local RV dealer and modified it to attach to a PVC post cover.
5th wheel is currently in a storage building without enough room along side to install new tube. Will finish installing in the Spring.