... efficiency,small volume,light weight,and compact structure.Air cooling structure,pressure rise 98Kpa,no need of ... auto self- tensioned structure to ensure the belts are always optimally tensioned.The pulley use the ... blower,inlet silencer with filter,outler silencer,pully,belts,belts cover,pressure release valve, check valve,flexible joint ... free to ask me. ZYSRH150 air blower high pressure roots blower