Our pressure regulators, filter regulators, filters and oilers made of brass or stainless steel are European quality products. You can select from various sizes (G 1/4" to G 2") as self-relieving or not self-relieving version. Self-relieving regulators can only be used with non-hazardous gases, as in the event of an overpressure these vent the overpressure into the atmosphere on the secondary side. Non-self-relieving pressure regulators (so called pressure reducers) must be used for fluids or gases that must not leak into the environment. Tip: Often precision pressure regulators (G 1/2" to G 1-1/2" offer significant price advantages compared to other regulators made of stainless steel.