External level control
with make-up water feed
for ra water tank type 1 S, 2 S
230 V/50 Hz

For external installation

Consisting of:

1 Transparent PVC pipe with 4 bistable
  change-over contacts
1 PVC ball valve DN 20 for the 
  connection to the overflow collector
  tank and the draining device
1 Make-up feed of fresh water
  consisting of:
  1 Solenoid valve 230 V AC, 50 Hz,
  R 3/4"
  1 Y-valve R 3/4"