Seems if I'd have bought a different "magnaclean" then attaching a power flusing rig is a doddle. This is the Fernox one:   There's also ones you attach in place of the pump motor. This is circa £100 from the people who make the power flushing rig:     A quarter of the price this generic one:     Both though mean getting the power flush rig up into the loft.   Still planning to connect something where the IntaKlean unit fits.