Flow regulators series "UR" are produced in three different versions, unidirectional (type "URG") - bi-directional (type "URF"), to have a precision in-line regulation; unidirectional (type "URE"), when it’s necessary a standard in-line regulation with reduced dimensions, and in the silenced exhaust version (type "URS"). In-line precision flow regulators type "URG"-"URF" are available in different adjustment scale in the size G1/8" (see the flow charts in the datasheet).