New In Box Presto Pressure Canner Cooker Gasket Seal Ring 9907 Fit 16 & 21 Qt PRESTO GASKET RING NUMBER 9907 NEW IN BOX WITH AIR VENTWE WILL COMBINE SHIPPING AND SHIP EACH ADDITONAL GASKET FOR 1.00 SHIPPING. Sealing ring fits around inside rim of cover and forms a pressure-tight seal between cover and body during cooking. Fits 16 quart Nos.7; 7S; 7AV; 7B; CA16; 01/CA16H and CA16H; and 21 quart Nos.21; 21S; 21AV; 21B; CA21; 01/CA21H and CA21H. WITH AUTO AIR VENT 16 & 21 QUART