Ultimus I
Has a 0-7 bar (0-100 psi) pressure regulator that handles all fluids.
Ultimus II
Features a 0-1.03 bar (0-15 psi) regulator that provides greater control when dispensing thin fluids.
Ultimus III
Uses a 0-0.35 (0-5 psi) regulator for extremely fine control when dispensing solvents and other very thin fluids