Hi,
I flushed a radiator and lost pressure in the system. I can't seem to find the filling loop. Under the boiler there are 2 black valves either side of the yellow(gas) valve but I don't see any filling loop or a space where one would go.
The first 3 pics are the boiler and the rest are the upstairs water tank.

I flushed a radiator and lost pressure in the system. I can't seem to find the filling loop. Under the boiler there are 2 black valves either side of the yellow(gas) valve but I don't see any filling loop or a space where one would go.
The first 3 pics are the boiler and the rest are the upstairs water tank.

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