The caps that that cover my plumbing vents are pretty beat up, but I have had no joy in trying to replace them.
I bought one of the above vents, which look a lot like the original, but it has no where near the flexibility to curve round the corner where the vent cover must be placed.
I visited the Bigfoot
homepage and certainly don't have anything that looks like a parts department. I also suspect they didn't make them this way for long because they have 16 screws in them, and are really hard on the fiberglass.
Anyone have any ideas?