

FILLER TAP FERROLI 39817490 1/2 3/4
LONG-->5,9 CM
ATLAS
GNTK UNIT
SILENT K
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FILLER TAP 1/2 3/4 39817490 = 36901360
It’s used to add water to the heating system and increase the boiler pressure when it’s too low.
It may leak water, not let water through (preventing pressure from rising), or not close completely (causing pressure to rise on its own).
If it leaks, doesn’t increase pressure when opened, pressure rises on its own when closed, or feels stiff/jammed.