Air vent. For Presto pressure cookers and canners. Use this air vent on cookers and canners prior to 1977. Fits model No. 40, 103, 403, 603, 703/733, 803B/833, B301A/B301B, B302A, C301A/C301B, 40-104, 50-60, 204, 404, 604, 704, 744, 804/804B, A401, A403A/A403AD, A403AT/A414A, 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, A607-A621A, A609A, A610A-A620A, A611A-A619, A612-A615-A622, A613, A616-A623, B601A-B602A, B604A-B605A, C601A-C603A, KR03A-PB02A-PB09A, KE03AT, PB06A-P810A, 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, 02/PCE6H, 7-7S, 7AV-14, 7B-CA16, 21-21S, 21AV, 21B-CA21, 01/CA16H-CA16H, 01/CA21H-CA21H, 01/CAA12H, 01/CAA20H, 02/CAA12H, and 02/CAA16H-02/CAA20H.