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Tri-Block Auto w/ Long Adjustment Screws • Used on DCI Edge Series 4/5 Delivery Systems • Works with normally closed automatic • Consistent flow control for handpiece pressure adjustments • Higher output due to improved airflow • Longer lasting diaphragm • No internal cross-over of air or water • Twin-Block dimensions, 1 1/2" x 1 1/2" x 1" • Tri-Block dimensions, 2 3/8" x 1 1/2" x 1" • Quad-Block dimensions, 3 1/8" x 1 1/2" x 1" • Quin-Block dimensions, 3 3/4" x 1 1/2" x 1"