Kapstadt completed his hat-trick over hurdles under a smooth ride from Will Kennedy at Newton Abbot.
He won his first hurdles race over this course and distance off a mark of 95 in March, followed up off 102 at Stratford and made it three from his last three over timber off 114.
Kapstadt had shown his well-being with a fine second on the flat at Goodwood last month, and he should be able to add to his account on the level from his mark of 81 this autumn.