Yes, you must visit a refill station and purchase a tank refill at a lower price than your initial purchase Yes, you can refill it if it's a refillable tank. If your tank can be refilled, almost any gas or welding supplier in your area can do so. You can't refill a lightweight tank (one use), or one that has too much physical wear, or one that simply states that it's a "one-time disposable tank," duh!.