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Hi, we have recently had a pergola installed. There is guttering along the front edge, from which there is a short piece of downpipe before a 90-degree joint and a horizontal section that carries water back towards the house. It is leaking from the joints around the 90-degree angle, as shown in the pictures below. I have taken the section apart, expecting to find some sort of seal between the joints, but there is none - they just slot into each other, and are held in place with screws. I have no knowledge of guttering - please can you tell me if there's a quick and simple fix to this? For example, could I put a bead of silicone inside the joints? Thanks.