・Valve is mounted on a round cylinder. ・Built-in speed controller for some models. ・Cylinder with a valve makes it easy to adjust speed. ・With auto switch (Series CDVJ: CDVJ5, CDVJ3, Series CDVM: CDVM5, CDVM5K, CDVM3, CDVM3K, Series CDV3: CDV3, CDV3K, Series CDVS1: CDVS1,