Barrel drain

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(Arch.) a drain in the form of a cylindrical tube.

See also: Barrel

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Your customers may cock an eyebrow at the short barrel and ask, "Won't that short barrel drain off too much velocity?"
I still have it, and while its 18 1/2-inch barrel drains off a bit of velocity, it's ideal for maneuvering in cramped quarters.