Multi-Tork's '3.0' model MT-101 Quad-Cavity is one of the most versatile sockets in the pool industry today. The Quad-Cavity side has not changed. Yet another piece of hardware is added to this side(pump lid # 3 and seen at the beginning of the video). The redesign of the other end gives the entire socket a sleek new look. The -101 is part of the money-saving Value Pack trio(MT-301).