I prefer the USplastic floats over Kents.I heard that Kent has improved there original design that had a very small orifice which was prone to clogging.If your not going to use your float for kalk/limewater than its not that big of an issue.I fyou do plan on useing kalk/lime,buy one with the biggest orifice you can.Either way,they ALL will clog eventually and neeed to be soaked in vinegar periodically to remove the calc deposits.
I got a float valve from this guy who makes them from his home in Cali. I have had this same one on my 65 and now on my 110. I have had it for 4 years with no issues at all. follow the link