a fluid control mechanism utilizing a housing having an opening or tunnel through the interior of the same . the housing provides at least one chamber communicating with the housing opening . a seat positions within the housing opening and the chamber . a plug , adapted to occupy the seat and close to restricted passage , positions within the first chamber . particulate filter means comprising a pressure deformable section which includes a passage to the housing opening partially filled by a relatively rigid filter element . a gap in the filter means passage allows compression of the deformable section .