Patent ID: 8480778

Claim:
An air filter cartridge comprising: (a) media surrounding an open filter interior and having first and second ends; (b) a first end cap positioned on the media first end; (i) the first end cap having a central aperture therein; (c) a radially directed seal member positioned on the first end cap; (d) a second end cap positioned on the media second end; the second end cap including an inner surface and an outer surface; (i) the outer surface including a first receiving groove at least 6 mm deep therein; (A) the first receiving groove having inner and outer walls; (B) the outer wall of the receiving groove being spaced radially inwardly at least 20 mm from the media pack; and, (ii) the inner surface having a central receiver projecting outwardly away from the first end cap; (A) the central receiver being formed by an inner surface of a central projection; the central projection being on the outer surface of the second end cap and projecting away from the first end cap; and, (iii) the central receiver being surrounded by the receiving groove.