Yes, easy - you can reach them from the engine bay. I’ll post a link to my ‘how to’…This is what @Herts Hillhopper indicated earlier - but a “2 minute job” to check the duckbills in a 312/9?? They’re hidden away behind that plastic bulkhead thing which needs to be removed (which - for me! - would be half a day’s work and no guarantee I’d be able to finish, never mind put all the bits back together again… )
Edit: see here https://www.fiatforum.com/threads/scuttle-drains-no-duckbills.475219/post-4491914
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