... certification: 1, Hushun high and low water pressure switch is manufactured by a professional micro-switches and pressure switches ... for large-scale manufacturing enterprises as a whole. 2, High pressure ≥ 30Kg switch 3, Low water pressure start, blowing mouth ... Using environmentally friendly materials and products are environmentally certified. 6, Switch certification are: UL, VDE, TUV, CB, CCC, CQC, ...