The ISO 9001: 2008 DR-2 series provides greater accuracy and repeatability (+/-0.15 psi) to the MAR series regulator line while maintaining the same flow and performance in a small package. Regulators are offered in either relieving or non-relieving versions. The relieving design maintains a constant pressure output even when downstream conditions change, while non-relieving regulators do not automatically compensate for changes in downstream flow or pressure. There is no vent to atmosphere, as in a relieving-type regulator, and the output pressure can increase due to a downstream event. It is designed for applications where zero air consumption is required (non-bleed), has a manifold mount option, and features a non-rising internal adjustment.