Originally Posted by BruceB
Or are there good transom mounted filter housings out there that will last a bit longer exposed to the elements?
Don't know about any of the auto type filters, but the Racor filters I use look pretty ratty after about a season. The filter housing is painted steel, and it usually begins rusting and the paint peels about then. No problems with rust-through, though; and aside from appearance, it continues to do its job.
The filter base (mount) that I originally had was an aluminum Yamaha job; it looked hideous after a year. Replaced it with a stainless steel unit (I think it was also a Yamaha product - came with a Yamaha filter canister, anyway); looks a lot better now (even though it's mounted where one wouldn't normally be looking.)