A liquid filter assembly including: (a) a liquid flow collar (310, 310c) defining a central liquid flow passageway therethrough with a central axis; (i) the liquid flow collar (310, 310c) including a seal surface oriented to be sealingly engaged by a seal member, the seal surface defining a seal pattern non-orthogonal to a central axis of the liquid flow collar (310, 310c); and (b) a liquid filter cartridge oriented in releasable, sealed, liquid flow engagement with the liquid flow collar (310, 310c); the liquid filter cartridge including: (i) filter media surrounding an open filter interior; the filter media having first and second, opposite, ends; and defining a central axis; (ii) a first end construction positioned at the first end of the filter media; (iii) a second end construction positioned at the second end of the media; 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; and a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media, sealingly engaging, in use, with the seal surface of the liquid flow collar (310, 310c); characterized in that the liquid flow collar (310, 310c) has a first member of a projection/receiver rotational alignment arrangement positioned thereon, the first member comprising a radially outwardly projecting projection; and in that the second end construction further comprises a second member of the projection/receiver rotational alignment arrangement positioned on the second end construction, the second member of the projection/receiver rotational alignment arrangement including an interference projection member having a receiver gap at a location to engage with the first member of the projection/receiver rotational alignment arrangement on the liquid flow collar (310, 310c), in selected rotational alignment, in use. (a) a liquid flow collar (310, 310c) defining a central liquid flow passageway therethrough with a central axis; (i) the liquid flow collar (310, 310c) including a seal surface oriented to be sealingly engaged by a seal member, the seal surface defining a seal pattern non-orthogonal to a central axis of the liquid flow collar (310, 310c); and (i) the liquid flow collar (310, 310c) including a seal surface oriented to be sealingly engaged by a seal member, the seal surface defining a seal pattern non-orthogonal to a central axis of the liquid flow collar (310, 310c); and (b) a liquid filter cartridge oriented in releasable, sealed, liquid flow engagement with the liquid flow collar (310, 310c); the liquid filter cartridge including: (i) filter media surrounding an open filter interior; the filter media having first and second, opposite, ends; and defining a central axis; (ii) a first end construction positioned at the first end of the filter media; (iii) a second end construction positioned at the second end of the media; 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; and a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media, sealingly engaging, in use, with the seal surface of the liquid flow collar (310, 310c); (i) filter media surrounding an open filter interior; the filter media having first and second, opposite, ends; and defining a central axis; (ii) a first end construction positioned at the first end of the filter media; (iii) a second end construction positioned at the second end of the media; 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; and a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media, sealingly engaging, in use, with the seal surface of the liquid flow collar (310, 310c); 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; and a seal member positioned on the spigot to define a seal pattern non-orthogonal to the central axis of the media, sealingly engaging, in use, with the seal surface of the liquid flow collar (310, 310c);