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Ok, thank you.

There are flow and return pipes going off to 2 bedroom radiators and this fitting/device is on the return pipe. Anyone know what it is and what it does please?

Thanks, I got the idea from the linked pdf file. As the bottom of the pipe is in the sump there isn't really any airflow. The idea is to create a very slight constant vacuum in the sump so that any Radon gas that leaches out of the soil is carried up the pipe instead of penetrating through the...

We have had a recent Radon test and the results recommend that we have a Radon sump. The easiest way I can see is to excavate a small chamber in the garage under the floor of the house. I would then use a 4" or 6" plastic pipe to duct the Radon gas out through the garage wall and then run the...

Update: I have been too busy to do anything more about this recently, however, last5 evening while bleeding the radiators I decided to take a match with me. When I held the match against the bleed valve while bleeding I was getting popping noises and sometimes a flame. This says to me that...

Some of the radiators creak and squeak when warming up. The little "J" shaped plastic clips are missing from the brackets. Does anyone know where I can buy these clips please?

Ok, I would like not to have to go down the sealed system route if I can modify my system as suggested earlier to the combined feed vent type. This has the advantage of costing me very few £££ to do and hopefully eliminating all the air too.

Can I just say that we only moved into this house in April, the only work the plumber has actually done is to fit the new boiler in the garage, he is not responsible for any other existing plumbing in the house. This shows the pipe layout in the airing cupboard . Ignore the arrows on the...

Yes, the system is in that order although the feed and vent pipes are both connected to an Airjec device.

something like this?