not subjected to tapping; "an untapped keg"; "an untapped sugar maple"

The alternative choice to Tapped Rack Rail. As described under CLIP NUTS previously, untapped rack rail has EIA standard spaced 1/4" holes which employ a specialized clip nut. The advantages of Untapped Rack Rail over Tapped is the ease of dealing with stripped threads. One simply needs to replace a clip, not an entire rail.

not drawn upon or used; "untapped reserves of coal"; "the untapped stockrooms of our minds"- G.R.Harrison