White Plastic C Bird Vent 30540 2 part vent, base has a 70mm hole. Designed to drain away any rain or sea water that flows in with air intake for a cabin, engine room etc.
Louvre Vents - Plastic With Tail Vent Louvre Plastic White C/W 100mm Tail 176035 Moulded ABS plastic louvre vent with hose tail to suit 75mm or 100mm ventilation hose. Available in black or white.814