Armature with Retaining Ring 120V, For Use With Grainger Item Number 1UNH8, 1UNH9, 1YMJ7, 4Z714, 4Z715, 5PYN3, 5PYN4, 5PYN6, 5PYN8, For Use With Mfr. Model Number HG-201A, HG-201A-MC, HG-201AK, HG-301A, HG-301A-MC, HG-301AK, HG-501A, HG-501A-MC,...