good advice guys except it's wrong, fernox Superconcentrate comes in a tube simiar in size to sealant it comes with adaptors to screw in2 a bleed nipple on a rad, turn off both valves, take out the bleed nipple on the rad (make sure u have some towels underneath cause u will have water there) connect up the tube open one end only of the rad & pump it in turn the rad valve off & disconnect the tube (some of it will leak out) put the nipple back in & open both valves run the heating, trying to put it in2 the boiler will do no good at all cause as soon as u turn on the heating it will go straight round the rads it won't stay in the boiler, if u are talking about the new pressurised f series then this needs to connect to the filling loop with may be part of the boiler so these won't connect get the Superconcentrate in the mastic type tube u will need a sealant gun
Keith Gillyon
February 2010