Senior Moment Member
Join Date: Jun 2011
Location: West Vancouver B.C.
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The problem with that is that the gaskets are usually what goes. If they are not kept lubricated or held in a poor position (like when the switch is set to prevent water from entering) then the gaskets can harden or deform over time. I don't know if I'd want mine sitting for 3-4 years before usage unless I was travelling to places on earth where one couldn't be sourced.
A spare is a good idea though.
I've never heard of them having a shelf life, only a service life.
I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.