Parellel Connection Filter Housings is also called double switching filter which is composed of two sets of stainless steel filters in parallel with novel and reasonable structure, good sealing performance, strong flow ability, simple operation and other advantages, multifunction filter equipment wide application range and strong adaptability. Especially bag side leakage probability is small, can accurately ensure the filtering precision, and can quickly replace the filter bag, without the basic filter material consumption, the operating cost reduced.