10 includes a blow dome 16 joined to the top of the neck 12 at a circular groove 18 extending around the neck 12 during initial trimming of the bottle 10 the blow dome 16 is severed from the neck 12 at the lower wall of the groove 18 so that the bottom of the groove 18 forms a circumferential flange 20 extending inwardly from the top of neck 12 a pair of 180 degree opposed v recesses 22 are formed on the inner edge 24 of flange 20 the v recesses 22 are the consequence of blow molding a bottle 10 having a neck 12 with a diameter less than the diameter of the parison from which the bottle 10 is blow molded the neck trimming apparatus 40 disclosed herein trims away narrow rings of plastic from the inner edge 24 of flange 20 along circular trim line 26 located radially outwardly of the v recess to form a new completely circular inner edge on the flange 20 suitable for forming a tight seal with linerless cap 28 linerless cap 28 includes a circular top 30 a cylindrical side 32 joined to the top 30 an interior spiral thread groove 31 engagable with bottle thread 14 and a circular bevel ring 34 having an outwardly facing bevel.