Zinc Gutta have purposely designed the downpipes in 0.7mm zinc so the gutter profiles can be bonded together quickly and easily as no special tools are required during the installation process. When used alongside the brand's own silicone sealant and rivets, it has been laboratory tested that you are able to create a sturdy and watertight system that provides complete stability for over 100 years. Sold as 2.4m lengths, the 80mm x 80mm Zinc Gutta downpipes are the key to a complete guttering system. Downpipes are the element that carries the rainwater from your gutter, directly into the drain and away from the ground.