Presto Pressure Canner Cooker Gasket Seal Ring 9985 PRESTO GASKET RING NUMBER 9985 NEW IN BOX WITH AIR VENT Genuine Replacement part. Fits Model 0175107 18 quart canner; 0178107 23 quart canner; and 01755 16 quart canner. Includes over pressure plug. We will also combine shipping and ship each addiitonal gasket for 1.00 shipping. WITH OVER PRESSURE PLUG Boxed