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 Do they come in different sizes? Where can I buy ACO gullies? How to Install RainDrain B 125 Comments 0 comments Please sign in to leave a comment.