float valves

[Scavenger]

Well I'd go to Home Depot (some plumbing and water filtration units use them), Anchorage Marina, Westwood Marine (Some marine engines and boat appliances use them) ect. Have all the pertenant information ready when you if you don't have the original. Just make sure the new one will handle salt water.
Most parts places only have part numbers for certain model whatevers to look up and not be listed for certain sizes, so you may have to talk really nice to them and ask to look at various ones.