While treatment holes need to be plugged to keep out excess moisture, insects and fungal spores the method of sealing these holes varies. The advantage of the Cobra Plugs is their quick release threads which can be removed for future inspection and retreatment. However, in highly visible areas it may be preferential to plug the holes with wood dowel or other wood filler. Other times a small amount of caulking or wood filler is applied over the Cobra Plug just to hide it.