Do you mean for the CW supply or drainage? The machine empties into a settlement tank and then into a Drainmajor which will pump it up about 5m to a soil stack in the building. CW wise, I'm undecided what fluid risk it is at the moment. It doesn't actually hold any water as such, it just fills at a steady rate from the top of the drum and discharges out of the bottom through an open waste. Its not possible for it to over fill into the machine itself as the water just runs straight out of it. Id like it to be CAT 3, but it might be CAT 4