drop valve
noun
a valve, as for a steam engine, that drops freely to close.
Words nearby drop valve
drop table, drop tank, drop tee, drop the ball, drop the handkerchief, drop valve, drop window, drop zone, drop-dead, drop-dead date, drop-dead fee
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020