2.0 LITER GAS. Oil filter hsng o-ring. PartQualifier: small. small. A circular disk covered in rubber or plastic with a hole in the center where the edge is sometimes tensioned by a spring that prevents fluid from leaking at the Engine Oil Filter Housing. Engine Oil Filter Adapter Seal. Engine Oil Filter Housing O-Ring. Adapter. hsng o - ring. Included with: Filter assembly, Oil Filter Housing.