I use an adjustable Fisher Scientific (IIRC) unit that goes up to about 30 psi . I seldom get over about 10 though , just don't need that much pressure if everything is running right . One mod that a lot of people do with the Reil design is use a MIG tip for an orifice . Mine are just a hole drilled in the side of a piece of 1/8" pipe and they work just fine .