| 摘要 |
<p>A screw-on filter unit has a casing (10) which includes an end wall (16) which is formed integrally with a side wall (15). A screw threaded aperture (18) is formed in the end wall so that the filter unit can be secured onto a mounting. The casing accommodates a filter element (11) and the open end of the casing is closed by a closure plate (17). <IMAGE></p> |
