I stumbled across a device called the econovalve while doing some dd for this company under walkers new products section of their site. If this new product isn't made by savicorp then I'm a monkeys uncle. It has much of the same wording that savicorp uses too. Yahoo won't let me post a link so take a look for yourself.
I don't see any patent info from Walker. Can you provide that? Also, if you look the test data they use is the EXACT same Savi had already put out for their Econovalve. Savicorp has a deal with Walker to distribute the Econovalve.