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A constant velocity joint vent for use in a constant velocity joint. The vent includes a permeable membrane located within a chamber of the vent. The vent further includes a neck having a plurality of orifices thereabout, wherein the orifices allow gases to travel between an interior and exterior of

A constant velocity joint vent for use in a constant velocity joint. The vent includes a permeable membrane located within a chamber of the vent. The vent further includes a neck having a plurality of orifices thereabout, wherein the orifices allow gases to travel between an interior and exterior of the vent. The orifices also provide a secondary function of stopping any lubricant from entering and contaminating the permeable membrane of the vent system.

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A constant velocity joint vent for use in a constant velocity joint. The vent includes a permeable membrane located within a chamber of the vent. The vent further includes a neck having a plurality of orifices thereabout, wherein the orifices allow gases to travel between an interior and exterior of

A constant velocity joint vent for use in a constant velocity joint. The vent includes a permeable membrane located within a chamber of the vent. The vent further includes a neck having a plurality of orifices thereabout, wherein the orifices allow gases to travel between an interior and exterior of the vent. The orifices also provide a secondary function of stopping any lubricant from entering and contaminating the permeable membrane of the vent system. ipheral portion so that the curvature of the annular peripheral portion positions said peripheral surface of said abrasive disc in a plane passing through said foam disc. 2. A sanding disc according to claim 1 wherein the portion of said first major surface on the annular peripheral portion of said abrasive disc is, at each location around said annular peripheral portion, generally circular around a peripheral portion axis in a plane parallel to and passing through the axis of said abrasive disc and said each location. 3. A sanding disc according to claim 2 wherein the radius of the portion of said first major surface on the annular peripheral portion of said abrasive disc around said peripheral portion axis at each location around said annular peripheral portion is in the range of about 2 to 7 inches or 5 to 18 centimeters. 4. A sanding disc according to claim 2 wherein the radius of the portion of said first major surface on the annular peripheral portion of said abrasive disc around said peripheral portion axis at each location around said annular peripheral portion is about 6 inches or 15 centimeters. 5. A sanding disc according to claim 1 wherein said circular central portion has an outer diameter smaller than the outer diameter of said foam disc. 6. A sanding disc according to claim 1 wherein said foam disc and said abrasive disc each have a central through opening about said axis with the central through opening in said abrasive disc being significantly larger than the central through opening in said foam disc. 7. A sanding disc according to claim 1 wherein said layer of backing material in said abrasive disc is of cloth. 8. A sanding disc according to claim 1 wherein said abrasive material in said abrasive disc has a grit size generally in the range of 60 to 200.