Plumbárius, Adiectiuum. Of lead or for lead. vt Plumbaria officina. Plin. Plumbárius rij, m. g. A plummer, or worker in leade.
Lewis and Short: Latin dictionary
plumbārĭus, a, um, adj. [id.], of or belonging to lead, lead-: artifices plumbarii,
workers in lead
,
plumbers
, Vitr. 8, 7: officinae,
plumbers' shops
, Plin. 34, 18, 54, 175: metallum,
a lead-mine
, id. 33, 7, 40, 119.— Subst.A. plumbārĭus, ii, m. (sc. artifex), a plumber; plur., Dig. 50, 6, 6.—B. plumbārĭum, ii, n., a place to keep leaden vessels in: plumbum, plumbeus, plumbarium, Not. Tir. p. 164.