A fitting or device supplied with water or other fluid under positive pressure that passes through an integral oriface or constriction, causing a vacuum. Aspirators are also referred to as suction apparatus, and are similar in operation to an ejector.
(International Plumbing Code® 202.0)
Plumbing Code…
A fitting or device supplied with water or other fluid under positive pressure that passes through an integral orifice or constriction, causing a vacuum.
(Uniform Plumbing Code® 203.0)