The steam gauge registers pressure readings during canning and cooking. This gauge uses a Black Rubber Adaptor Part No. 85731 (which was formerly Part No. 33136). This adaptor is included. Compatible Products 17-Quart Pressure Canner 0175002 17-Quart Pressure Canner 0175003 17-Quart Pressure Canner 0175004 22-Quart Pressure Canner 0178002 22-Quart Pressure Canner 0178003 22-Quart Pressure Canner 0178004