A whisky cask is a barrel that is used to age whisky. The cask imparts flavor and color to the whisky as it ages. Whisky casks are made of oak and are usually charred on the inside to help the whisky extract flavor from the wood. Used whisky casks are often re-used to age other spirits, such as rum or wine.

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When buying a whisky cask, it's important to consider what kind of flavors you want your whisky to have. American oak tends to impart vanilla and caramel notes, while European oak can add spice and dried fruit flavors. You should also think about how long you want to age your whisky; younger whiskies don't need to be aged for as long as older whiskies.

1. Know Your Whisky: One of the most important things you need to do when buying a whisky cask is to know what type of whisky you want. 

2. Find a Reputable Dealer: Once you know which type of whisky you want, your next step is to find a reputable dealer who specializes in selling whisky casks. There are many different dealers out there, so it's important that you take your time in choosing one. 

When you purchase a whiskey cask, it is important that you take the time to store it properly. If you do not, the cask could leak or even break, and your whiskey will be wasted.