The Strainers has already passed ISO9901:2SO9901:2000 quantity certification,They are of low price andrice and high quality. specification modelPTFLOWl/minFILTRATIONMESHWEIGHTkgMF-041/2''301000.09MF-063/4''551000.15MF-081''1101000.18MF-101,1/4''2101000.21MF-121,1/2''2851000.32MF-162''3951000.42 Strainers