We are looking for control water level switch on clothes washing machine with below specification. 1) Possibility to set three levels of water 2) Minimum and maximum pressure between 200 and 700 mmH2O (milimeters of water level) 3) could be mechanical or electronic technology, but now I prefer mechanical technology 4) Diameter not bigger than 60 milimeters who can provide and offer to me ? Please send me information. Look forward to receive information from you soon Quantity: 20000pcs