A cable holder may include a body portion, a cable receiving portion structurally configured to extend through the body portion along a longitudinal axis of the body portion, and a sealing portion structurally configured to be coupled with the body portion. The sealing portion may include an engagement portion structurally configured to extend radially inward from the body portion into the cable receiving portion so as to narrow a cross-sectional passage through the cable receiving portion. A first portion of the engagement portion may be structurally configured to sealingly engage a cable having a first outside diameter that is greater than or equal to a first diameter and less than a second diameter, and the first portion and the second portion may be structurally configured to sealingly engage a cable having a second outside diameter that is greater than or equal to the second diameter such that the cable holder is structurally configured to sealingly hold cables having different sized diameters.