Vent piece

(Gun.) A bush. See 4th Bush, n., 2.
A breech block.

See also: Vent, Vent

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
KINGS PARK Internal alterations to swap bathroom and bedroom around and installation of slate vent piece to roof of north elevation at 22 Albert Place FK8 2RF for Mr and Mrs M Lawton.
Then align the ridge vent pieces. Nail one side of the vent in place with 2-1/2 in.