I've had mine on for 12 years and it still works fine. I talked to a PSS rep at the boat show one year and he said you just need to check the bellows every so often to make sure it's still soft plyable and not brittle. He said they'll probably last for 15 years or so but they don't put that in writing because it (a) hurts sales (b) could lead to lawsuits if a boat sinks because one fails and (c) hurts sales.
I'm not advising that you leave yours in as long as I have, because I don't want to be sued if your boat sinks. (Don't bother anyway - I'm not worth suing - always go after the deep pockets.)
I'm probably going to have mine changed out next time we pull it - next summer some time.
Saltwater Suzi and Cap'n Larry
"A sailboat is a fickle mistress. You’ve got to buy her things. You’ve got to understand everything about her. What you don’t know she’ll use against you." -Captain Larry
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