A liquid filter cartridge configured for use, in installation, in removable sealing engagement with a liquid flow collar of a liquid filter assembly; the liquid filter cartridge comprising: (a) filter media surrounding an open filter Interior; (i) the filter media having first and second, opposite, ends; and, defining a central axis; (b) a first end construction positioned at the first end of the filter media; and, (c) a second end construction positioned at the second end of the media; (i) the second end construction being open, and including a central spigot projecting away from the media and surrounding and defining a central liquid flow aperture in liquid flow communication with the open filter interior: (ii) a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media; and, (iii) a non-seal member of a projection/receiver rotational alignment arrangement positioned on the second end construction at a location to engage another member of the projection/receiver rotational alignment arrangement on a liquid flow collar, in selected rotational alignment in use; characterized in that said non-seal member includes a radially directed fin member on the second end construction positioned extending in a direction between the central spigot and an outer perimeter of the second end construction; said non-seal member includes a radial abutment member having an abutment surface; and, the radial abutment member defines a collar-receiving gap between a portion of the radial abutment member and a portion of the spigot; the collar-receiving gap is traversed by the radial fin member at a location between the gap and the media. (a) filter media surrounding an open filter Interior; (i) the filter media having first and second, opposite, ends; and, defining a central axis; (i) the filter media having first and second, opposite, ends; and, defining a central axis; (b) a first end construction positioned at the first end of the filter media; and, (c) a second end construction positioned at the second end of the media; (i) the second end construction being open, and including a central spigot projecting away from the media and surrounding and defining a central liquid flow aperture in liquid flow communication with the open filter interior: (ii) a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media; and, (iii) a non-seal member of a projection/receiver rotational alignment arrangement positioned on the second end construction at a location to engage another member of the projection/receiver rotational alignment arrangement on a liquid flow collar, in selected rotational alignment in use; (i) the second end construction being open, and including a central spigot projecting away from the media and surrounding and defining a central liquid flow aperture in liquid flow communication with the open filter interior: (ii) a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media; and, (iii) a non-seal member of a projection/receiver rotational alignment arrangement positioned on the second end construction at a location to engage another member of the projection/receiver rotational alignment arrangement on a liquid flow collar, in selected rotational alignment in use; said non-seal member includes a radially directed fin member on the second end construction positioned extending in a direction between the central spigot and an outer perimeter of the second end construction; said non-seal member includes a radial abutment member having an abutment surface; and, the radial abutment member defines a collar-receiving gap between a portion of the radial abutment member and a portion of the spigot; the collar-receiving gap is traversed by the radial fin member at a location between the gap and the media.