The gutter connector is an amazing invention. With its EPDM rubber it connects gutters together, and gutters and miters in a matter of seconds. EPDM is used sealing car or truck doors, and always remains soft and pristine. Fold the clip over the gutter’s front bead whilst leaving an 1/8" gap between the gutters. Lock it into place by closing the tab over the clip. Do not put any caulk, rivets, or screws to the product. This product allows for expansion and contraction of the system. By the way did you know that steel moves half as much and half as fast as aluminum, and with the EPDM rubber always staying flexible you have zero leaks.