Twin Wall 5/30 Flashing (018) - 100mm Dia Zoom Twin Wall 5/30 Flashing (018) - 100mm Dia SKU: 030910181DW. Lead based flashing with a stainless steel upstand. Used to ensure water tightness in the passage through the roof. It also protects the rubberised flashing from extreme weather conditions Availability: In stock £95.99 Qty: Add to Cart Email to a Friend Additional Information Additional Information Additional Information SKU 030910181DW Diameter 100mm (4") Components Flashings CMS tab x Add to Cart Price: Actual Price: Our price is lower than the manufacturer's "minimum advertised price." As a result, we cannot show you the price in catalog or the product page. You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart. Our price is lower than the manufacturer's "minimum advertised price." As a result, we cannot show you the price in catalog or the product page. You have no obligation to purchase the product once you know the price. You can simply remove the item from your cart.