|
You need to turn off #2 to isolate the boiler to work on the leak.
#4 is the main shut off for the whole house. You will have no domestic water (water for the toilet, shower, kitchen etc.) and the sprinkler system will not work if you turn it off.
#1 is the dual check valve/boiler feed/pressure reducing valve. Leave this alone.
__________________
HKS | DAIZEN | TRD | TOM'S | K&N | B&M | FIGS | SSR
|