"This a tight fitting range of products and no solvent adhesive is needed. The male end fits inside the pipe and the pipe fits inside the female end so obviously if you need to join two bends close together you need to fit a 50mm long piece of pipe inside the female socket and push fit the male end of the other fitting inside that. If you don't do this the joint will be 'wobbly' as stated above. Do it properly. To add to overall support of the downpipe fit the lowest bracket below the collar of the shoe not above on the pipe. This will stop the whole pipe sliding down."
"Nicely made and finished, competitive price, but very poor fit, even with downpipe bought from Screwfix. Had to solvent weld all joints to stop them wobbling about. Check yours before you leave the store, preferably with a short section of pipe that you intend to use."