Yes. The sliding doors are the little things on the bottom, but there's only one on a standard new Vault. They're a little loose and leaky so the valve solves that issue and you connect your Guru straight to the valve.
Not sure on the valve cost as we didn't know it was an option until it was too late.
No real corrosion issues so far (other than maybe a little rust on a rack) and we cook with water so you'd expect some rust.
We transport ours on a modified car trailer with heavy duty straps crossed over the top. Thing doesn't budge.
Big City BBQ Comp Team - Large BGE - XL BGE - Pitmaker Vault - Nuclear Powered BRG Thermapen