Wade, ordered mine today. They have a warehouse here in Nashville. For anybody else interested or looking here's some information.
American Cap Company located in Wheatland, PA.
http://www.americap-mfg.com/valve.html They gave me a call first thing this morning and gave me another phone number to a dealer/supplier that will sell you just one cap if you want.
The supplier is RATERMAN Manufacturing out of Livermore, CA. They do not have walk in stores as I was told, do catalog/internet sales I believe is what she said. Phone number out there is 800-264-7793 very pleasant to deal with. The cap I'm getting was $48.45 and going to pick it up at their will call tomorrow.