Black FKM Fleck / Aqua-Pure 2500 / 2750 / 3600 Base Bottom O-ring PN: 10381
Part #: 10381. Opened and re-boxed, removed from a part of a larger assembly or just do not have a box at all anymore. The item may have been part of a larger assembly and removed. The box may be dirty or incomplete or just not there at all.