Dear Sir, Thank you for your kind interest in accumulator. Our accumulators functions as follows __ Protecting compressors from refrigerant&oil slugging, especially during inter-mittent operation. __ Refrigerant & oil misture is temporarily held and metered back to the compressor at the controlled rate for fear of any damage of compressors __Solid copper connections __ "U" type tube for maximum flow of refrigerant and minimum oil entrapment __Power paint exterior coating surpasses 500 hour ASTM salt spray tests. I hope we will establish business relations in the future as well as good friends. Please feel free to contact me If there is something what I can do for you. Welcome to visit our website WWW.newdonghae.co.kr My Tel: +86-24-23712208 Fax:+86-24-23713908 Best wishes and regards Lily(lady)