Originally Posted by rdwj
Here it is
I went to my LHBS to replace a poppet - they are also an internet shop: Beer-Wine Hobby -- I had the same valve (at least it appears so) that you have in your photo. They had a poppet there with a yellow top, looked a touch shorter, but had the same tapered shape at the top and same rubber seal location. I bought it. While it lacks some of the stiffness and spring pressure of the original, it works fine.
Hope this might be of help to you. -Lou