Made of Marine grade Nylon, Excellent seawater corrosion resistance and durable, hold up exposed to salt air on boat
Nylon is a lighter and lower cost solution, Strength and service life are exactly the same as 316 stainless steel
Flush Louvered Hose Ventilators are weatherproof, 4 slots are designed for straight-through airflow
Install with simple screws, we included the screws
Size: 5-1/2" (140mm) x 4.84" (123mm)

Packing Included:
2 Pcs Louvered Flush Plastic Thru Vent, Black 8 Pcs Installation Screws