The pressure regulator controls the amount of pressure that can be built up in the canner. It consists of the pressure regulator body and two 5-pound weight rings. Completely assembled, it will maintain 15-pounds of pressure. Compatible Products 01/C13 - 13-Quart Pressure Canner 01/C17 - 17-Quart Pressure Canner 01/C22 - 22-Quart Pressure Canner 0171001 - 13-Quart Aluminum Pressure Canner 0171002 - 15-Quart Aluminum Pressure Canner 0171003 - 15-Quart Aluminum Pressure Canner 0174001 - 17-Quart Pressure Canner 0174510 - 16-Quart Pressure Canner 0177001 - 22-Quart Pressure Canner 0178209 - 23-quart Pressure Canner 02/CAA12H - 12-Quart Pressure Canner 02/CAA16H - 16-Quart Pressure Canner 02/CAA20H - 20-Quart Pressure Canner