Date: 12/31/1969 Views: 3423
Date: 01/09/2004 Views: 3785
Date: 10/19/2009 Views: 3333
Date: 08/23/2023 Views: 115370
Old 1/4 in (6.4 mm) vent on the top. Totally inadequate for the job. New 3/8 in (9.5 mm) vent on the bottom.