The item is totally useless. It is made of Non-anodized aluminum. It bubbles and emits oxidized secretions in my pool water. I contacted the vendor and explained the situation. I got questions back, as if they didn't know what I meant. I have since spent over $70 on products that claim to prevent the oxidation. We will see. Bottom line is that the ladder is crap. I wouldn't recommend to install it in a sewer. Sorry aboit the long-winded review, but I am extremely upset with this product.