History; Over a 15month period I changed all my Central heating radiators. The replacement radiators all came with a free Drayton RT212 thermostatic valves. The hot water and central heating system has worked perfectly since.
But a few days ago an RTV valve head was bumped by the hoover and...
Hi,
Ive installed a few of these tho none in the UK.
For the best results AND no horrible black stuff seeping thro the brickwork into the room in future years I would always fit a stainless liner of the diameter recommended by the manufacturer.
After the liner is in place fill the void...