to fig2 and 3 the filter 30 is positioned in the housing 22 in the space between the filter retaining turn 14 and the filter mounting surface 28 as the filter 30 is inserted in the above defined space the peripheral margin 32 of the filter 30 abuts the filter locating turn 16 thus properly locating the filter 30 in the housing 22 in addition the filter 30 exerts a force on the filter retaining turn 14 which due to the geometric turn construction of the coiled latch 10 allows it to deform displacing the free end 18 generally radially inwardly of the coil 12 and causing the retaining turn 14 to exert a counter force against the filter 30 forcing it into a sealing relationship with the filter mounting flange 28 of the housing 22 the relative positions of the free end 18 and retaining turn 14 with and without the filter 30 in place can clearly be seen by comparing fig1 and 2 now turning to fig4 6 there is shown another construction of the preferred embodiment in the form of a coiled latch 110 which comprises at least two turns generally in the form of a conical helix the smaller turn 114 is a filter retaining turn and the larger turn 116 is a filter locating turn the end of the coil contiguous to the retaining turn 114 is a free end 118 and the other end of the coil.