All of the models in the Roots URAI and URAI-DSL series can be ordered as metric models. These units are identical to the US-standard models except they have BSP inlet and discharge connections and the shafts are sized in mm according to ISO 286-2 standard. If you want to swap out a Metric model for a US-standard model or vice versa, be aware that you will need to make adjustments to your piping and your drive components (belts, pulleys).