I've managed a temporary fix with a cheap coupler and covered the ducting with a bigger piece, I've ordered a IP67 one which I'm hoping will fit in the bigger bit of ducting then I has going to jubilee clip either side, it's a bit of a cowboy job but hopefully it will work as the camera is now working. If it fails I was going to try using that haydon splitter from the camera working on the left of the second picture