12 Ltr steel
Bit Rusty - Requires tumble or shot blast before O2 clean

12 Ltr Steel
Slight Rust - requires tumbled to remove rust

Cylinder shrunk
If the boot won't stay on - tape it

Cylinder
This can happen if you don't remove the boot now and again

Dirty Cylinder Valve
And they wonder why it was leaking

Cylinder Boot
Another example of what can occur if you don't remove the boot to check and wash with clean water