These Nicro Ventilation Flexible PVC Cowls are a great way to supplement solar or 12V ventilating systems. The soft, flexible PVC Cowl Vents from Nicro Ventilation are safer than metal or other types of rigid vents. Due to their soft, flexible nature these vents deform if accidentally stepped on and then spring back to shape. You also dont have to worry about your jib sheet catching on these vents so there is no need to remove them before sailing. Key Features Includes durable Cycolac deck ring and cap Made out of Flexible PVC One year warranty Note: Installation Hardware Required: #8 fasteners