Please take note that for home filtration device we use a vessel fits a RO Standard Membrane 12 " X 1.8". Therefore the vessel should be: lengh 12, 3/4 " - up cover 3,1/8" - bottom cover 2,1/2 " . If you have in your cataloque this kind of vessel, we coul be interested to your offer considering a initial offer of 500 unit or more . Awating your answer, our best regards. 联系方式Co:Valter LACOVICH Add:Italy Email:v.lacovich@hotmail.it联系人:Valter LACOVICH国家:Italy产品类别机械五金v.lacovich@hotmail.it