... /min),high efficiency,small volume,light weight,and compact structure.Air cooling structure,pressure rise 98Kpa,no need of water cooling ... silencer,pully,belts,belts cover,pressure release valve, check valve,flexible joint,pressu-re gauge,shock absorber,expansion bolts.Optional accessories ... want to know more,feel free to ask me. ZYSRH150 air blower high pressure roots blower