[BlindHandyMan] faucet help

[spiro]

Hi I need help finding a faucet.
        It is sink mounted and is fed by the 1/4 or 3/8 flex tubig from my 
water purifier system.
The one that is there now has served for 18 years and has broken. Luckily 
it is a spring loaded device that shuts off automatically.
It was a "thumb press type."
Does anyone know where I might find a replacement?
i can give more details.
I thought I wrote to list, but can't see my message anywhere.
Anyone see it before?
Thanks