Volvo Penta CAV filter thread size

A cheap vernier caliper and thread pitch tool would be useful? Happy hunting


Thread pitch tool
The trouble is, without knowing which type the thread is I’d need multiple of those and only use them once. That’s ok in a house but on a boat it’s hard to justify. I can buy one of each size barb for less than the thread tools would cost.

Yes I do have calipers on board and will use them to measure
 
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