Odds are high the Fernco's are not factory supplied. They would cost more then just solvent welding the pipe.
More than likely, for some reason that gray pipe and or tank had to come out. The prior owner cut it out, and used the Fernco's to put it back together. The Fernco itself if applied right is a very good splice and will outlast the camper.
You mentioned silicone was used,
darleyhavidson wrote:
They are hose clamped in place and a copious amount of silicone was used to seal ends of rubber hose as well.
Unless they bought the wrong size, have no idea why they would have to put silly cone on that joint. They sell them in sizes to exactly fit the OD of the pipe. And that rubber against the smooth plastic makes a good tight fit along with the SS worm drive clamp.
Also, if the piping is black in color, it is most likely ABS plastic and not PVC. They sell ABS in some of the lumber yards and the cement to solvent weld it.
Hope this helps
John
