Really? Good to know, seeing as I work at O'reilly's now (formerly Kragen). Not all of their stuff is made in the US, but it's good to know some is. It's really hard to find US-made brake hydraulics now, and all the chinese wc's have metric bleeder screws on them :-|
But yes, I've had good luck with the Coni-Seal stuff I've been selling to my customers (shops as well, not just retail).