ITC’s 4in stainless steel clad airflow vent has a permanently attached 316 stainless steel cover plate for excellent corrosion resistance, on a neutral grey body. It suits 4in ducting in motorhomes, campervans and boats. The curved face looks neat and helps airflow, and the patented hose attachment (Patent #5,588,908) means no hose clamps or fixings are needed, the vent simply presses into place.