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Do what they did in the old days and caulk it with cold lead rope :wink:

No expansion vessel is needed but the ones i have fitted over the years have required a pressure-reducing valve and one or two have needed a blow off into a waste pipe ?....The instructions will tell you :)

One way is to connect a hose to mains tap or whatever and push other end of hose down the cold feed pipe from tank in roof and turn on mains pressure :shock: All water and air will come back round system and out of vent pipe into the same tank and then out of overflow pipe.....guaranteed to...

If the fittings on the boiler flow and return to the cylinder are male iron it's direct and female fittings mean a coil and indirect 8)

This is the way to go ! http://www.yourdailymedia.com/media/1138634009