What material are ACO gullies made from? October 15, 2019 10:19 Updated ACO stainless steel gullies are manufactured from grades 304 and 316 stainless steel and are fully pickle passivated. To view full product details please visit www.aco.co.uk Related articles Why do you coat the whole of your outlet? Do they have a foul air trap? Do they come in different sizes? How to Install Threshold Drain Comments 0 comments Please sign in to leave a comment.