Patent ID: 8877055

Claim:
A filter having a drain valve, comprising: a filter housing having media therein, the filter housing having a threaded opening and a valve seat surrounding the opening; a valve assembly comprising a valve member and a knob, the valve member having a valve head adapted to seal against the valve seat and a valve stem positioned within the threaded opening, the valve stem having at least one tab projecting from a top surface of the valve stem; wherein the at least one tab of the valve stem engages the knob to fixedly retain the knob on the valve stem; wherein the knob includes a relief surface formed in a top surface of the knob, and whwerein the knob is mounted upon the valve stem such that the relief surface is coplanar with the top surface of the valve stem and there is a clearance gap radially between the valve stem and the knob, the at least one tab extending radially across the clearance gap such that it is in contact with the relief surface of the knob.