The Pogo Plus pump incorporates several new features designed to ensure continuous high-volume delivery of low- to medium-viscosity coatings and adhesives, including: new two-inch air motor with “unbalanced valve” design for virtually unstallable operation; contained leak path that prevents material buildup on the drum; upper ball check for a reliable transfer; improved energized upper “U” cup that provides longer life with less leakage and divorced design for easy maintenance and prevention of material migration into the motor