Four piper

[Image:USS Buchanan 1936.JPG|thumb|200px|right|, 1936]
The term four piper, also known as a four stacker, is United [States Navy] terminology for classes of destroyers with four funnels. These include the classes listed below:
These classes were built for use by the United States Navy during World War I and subsequently "moth-balled". Fifty were loaned, under the Destroyers-for-bases deal to the United Kingdom when convoy escorts were desperately needed in the early years of World War II.