It's conventional wisdom to avoid stocks with really high dividend yields. A company's yield increases when the market lowers its share price, signaling potential skepticism that the company can afford its dividend payments. These troublesome stocks are often called yield traps.

But there are exceptions to every rule, and you can find the occasional gem that can support its juicy dividend yield. For example, look to the oil and gas sector, where you'll find various types of business that have crucial differences -- but all revolve around extracting resources from the ground and moving them to where they are needed.

Here are two quality companies with generous yields and valuations that make them an easy buy today.

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Source Fool.com