Just an example I grabbed from the net:
[ http://www.discountmarinesupplies.com/Fuel_Tank_Vents-Attwood_16073_Thru_Hull_Fuel_Tank_Vent.html?gclid=EAIaIQobChMI1ZW1lrfy2QIVQUSGCh3_VQF8EAQYASABEgIJ7PD_BwE ]
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