Automatically vents or exhausts air and acts as a visual indication of pressure. Use this air vent on Presto cookers or canners . Fits Model No. 40, 60, 103, 403, 603, 703, 733, 803, 803B, 833, B301A, B301B, B302A, C301A, C301B, 40, 104, 46, 50, 60, 204, 404, 604, 704, 744, 804, 804B, A401, A403A, A403AD, A403AT, A414A, A405A, A407, A409, A410A, A411A, A412A, A415A, A413A, A416A, B401A, B401B, B403A, C401A, C401B, KE02A, PB01A, KE02AT, PB05A, PB07A, SC-35, S-60, 01/PCA4, 01/PCC4, 01/PCC4A, 01/PCD4, 01/PCC4D, 01/PCC4H, 01/PCD4H, 01/PCE4, 01/PCE4A, 01/PCE4H, 01/PCS4, 02/PCS4, 02/PCA4, 02/PCA4H, 40, 106, 206, 406, A601, 706, A603A, A617, A603AD, A614A, A603AT, A608, A618, A605A, A605B, A607, A621A, A609A, A610A, A620A, A611A, A619A, A612, A615, A622, A613, A616, A623, B601A, B602A, B604A, B604B, B604C, B605A, B606B, C601A, C603A, KE03A, PB02A, PB09A, KE03AT, PB06A, PB10A, PB08A, PB11A, S-66, 01/PCA6, 01/PCC6, 01/PCC6A, 01/PCC6AD, 01/PCC6D, 01/PCC6H, 01/PCC6HD, 01/PCE6, 01/PCE6A, 01/PCE6H, 01/PCS6, 02/PCS6, 02/PCA6, 02/PCA6H, and 02/PCE6H. Pressure canners: 7, 7S, 7AV, 14, 7B, CA16, 21, 21S, 21AV, 21B, CA21, 01/CA16H, CA16H, 01/CA21H, CA21H, 01/CAA12H, 01/CAA20H, 02/CAA12H, 02/CAA16H, and 02/CAA20H.