You know the small round/hollow metal piece that sits inside a check valve (it holds an o ring, and the ball/spring sit inside of it)? What do you call those? One of mine is broken, and I'm having a really hard time locating a new one. Any ideas?
Also, I've noticed some what looks like rusty water very slowly dripping off of the pressure tank (same tank as you, though I must have something just a little bit loose). Has this happened to you? Should that tank be aluminum instead of steel?