Easy Change Replacement Cartridge, Features Twist On, Twist Off Mechanism, Quick Connect Fittings, 3,000 Gallon Capacity, Reduces Bad Taste & Odor, Chlorine Taste & Odor & Particulate Class III, NSF Certified, For Use With TV #s: 783-504, 787-756, 802-274 & 802-373, Not Included.