... 3.scientific design,full sizes 4.Fast delivery Filter for check valve,stainless sleeve filterSpecifications:1.Stainless sleeve:302,304,etc2 ... Valve Co.,Ltd is a large-scale manufacturer,specializing in design,production and sale of water supply and heating parts and accessories ... CNC lathes and full automatic machines,to ensure the quality;on the other hand,we positively adopt modern management system ...