Yes, that is how it seems to me; and that ought to take 25 years I should think.
No, $22 for the pair. They only shut off on big leaks, since they can't tell small leaks from normal usage. But hey, it is the big leaks that are most dangerous. 6' was only a dollar more. I was tempted by a shutoff valve connected to water supply that shuts the water off if sensors by the washing machine, water heater, etc. see water. But there is not enough room between my main shut off and the T to the washer for it, and I didn't want to deal with moving the main shutoff. Someday.