It uses No

decks and thru-hulls

Sprays Streams of Water Back Into the Livewell Tank Enriching the Water with Oxygen

Stereo/Bridgeable operation

Vetus TRAMONS - Cowl TRAMONS with plastic ring Garelick It uses NoThese cowl ventilators are made of silicone. Silicone rubber is a very flexible synthetic material with a service temperaturerange between 100C and +200C. It is resistant to UV light and does not discolour, so it will always looks like its brandnew. The cowl ventilators are removable and can be rotated after loosening the knurled base ring by hand. The ring nutsand mating deck flanges are made of hard plastic and the internal colour is red (RAL3020).