circumferentially apart from one another and a plurality of axially spaced circumferentially continuous bars 58c intersecting the spines 58b to form interstices 108 together the spines 58b and bars 58c form a foraminous filter surface for separating filterable materials from laundry liquid the filter screen 58 is generally conical in its overall external configuration tapering inwardly from its widest dimension at the rim 58a towards an inner circumferential and axially extending collar or friction ring 60 the top of the hollow space 57 is closed off by an abutment contact between inner cylindrical surface 52 of hollow barrel 51 and an adjoining cylindrical surface 35a formed on an enlarged embossment 35b provided on the hub 34 the cylindrical surface 35a is bounded on its upper and lower ends by a tapered shoulder 35c the hollow space 57 is thus configured as an annular filter zone in which the debris and lint laden laundry liquid will pass and the separated materials can be temporarily stored therein for selective removal by the machine operator the friction ring 60 is provided as an intergral part of the filter screen 58 and has formed therein a plurality of slits 62 fig2 which permit the friction ring 60 to expand over a retaining ring 64 formed on the exterior surface 35 of the hub 34 during removal or replacement of the outer agitator section 32 when the outer agitator section 32 is in place about the inner agitator section 30 the friction ring 60 is retained within an annular groove 66 formed in the hub 34 of the inner agitator section 30 just below the retaining ring 64 a tapered shoulder 64a conformably engages the adjoining portions of the filter member 58 the annular groove 66 is located.