Can anyone identify these raw water strainers?

Air filters were a tad grimy....

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Thanks, not used them before.
The filters were mainly just dirty and I've no idea how long since they were changed, I'm now keeping a record in the log book to keep track.
All fuel filters were changed and the fuel from both tanks was run through a 5 micron filter before we bought the boat, so gradually getting to grips with the maintenance
 
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