Anti-rotational plug seal for lock-down pump dispenser

A closure for a dispenser, the closure comprising:

• a body insert having a tubular member aligned along an axis, an annular flange extending radially outward from an outer facing of the tubular member, a plug seal wall extending downward from the annular flange, one or more frictional projections formed around a peripheral edge of the annular flange, and one or more anti-rotational projections formed along a circumference on the outer facing of the tubular member and wherein the one or more frictional projections are configured to sealingly engage a container neck;
• a closure having an annular top panel that sealingly engages a portion of the top facing of the annular flange, a skirt extending down from the annular top panel, and corresponding anti-rotational projections formed along a circumference on an inner facing of the closure and wherein:
• (i) the skirt sealingly engages a peripheral edge of the annular flange, (ii) container-attachment features are positioned along an inner facing of the skirt, and (iii) wherein corresponding anti-rotational projections of the closure cooperate with the one or more anti-rotational projections of the body insert to restrict rotation of the closure in a predetermined direction;
• and
• a pump engine coaxially positioned within the tubular member.