Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
I got dinged by the USCG Auxiliary inspector for having a rusty-near empty air horn in my cockpit locker. I'm looking to at a minimum replace the air bottle (keeping the horn), replace both the horn & air bottle with near-identical(no idea how what looks like silvered plastic rusts, but it has), or get one of the rechargeable ones.
The cheapest route is simply get a replacement bottle & be done with it. The rusty-plastic horn works just fine, it's just kinda ugly.
The most expensive is a rechargeable one. However, I'm intrigued by being able to recharge one. Assuming that you can keep it from damage, rust, etc., you'd theoretically never have to replace it, could just charge it from the air compressor in the marina work shop, or bring it home & charge it there.
FWIW, I would only go rechargeable for something that I would use a lot. I haven't had to use my air horn once in the 5 years I've had my C250, aside from an occasional quick tap to test it. In fact, it's 20 years old because I bought it with my Trophy powerboat. With proper protection from the elements, it will last another 20 years.
It always sits on my binnacle organizer, ready for emergency use on a second's notice. But it's so lightly used, I'd consider a rechargeable one to be more cost than needed, and potentially less reliable due to condensation of moisture under pressure.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.