... Characteristics, parameters, certification: 1, Hushun high and low water pressure switch is manufactured by a professional micro-switches and pressure switches ... , Using environmentally friendly materials and products are environmentally certified. 6, Switch certification are: UL, VDE, TUV, CB, CCC, CQC, CE, ... in one bag, 500pcs in one carton. low water pressure switch, water filter switch,micro switch