Saigao (SEKO) metering pump features: 1) Economic and rugged small mechanical diaphragm metering pumps. 2) mechanical diaphragm work, both as the same stroke of the plunger displacement and operation, but also in the crankshaft and transmission fluid lines formed between an insulating film. 3) Pump lightweight structure, which is simple and easy to repair. 4) SEKO unique mechanical diaphragm design ensures the delivery flow and stroke ratio of the linear relationship between the flow does not actually affected by work pressure changes. 5) SEKO compressive membrane so that the pump has a non-leakage characteristics. 6) the work of the high level of security, with no external moving parts.