The gutter joint with its innovative design has a rubber sealing for a better and guaranteed waterproof installation. The long-lasting EPDM sealing is attached from the factory with two spots of glue that makes it stay in the right position when installing. The gutter joint creates a firm and durable installation with its perfect fit and snap on function to the half round gutter. Absolutely no need for silicon or other sealant. Silicon will dry and will not be tight against the surface of the gutter and there’s a risk it will leak. This product is made of precoated galvanized steel in 0,7mm thickness and EPDM rubber. Because of the high quality steel it will age in the same way as all the other products in the system and no difference in design will occur.