COLORADO city water regulator. The COLORADO city water regulator is an external water connection for the direct supply of your water system in the vehicle. The integrated regulator with non-return valve is suitable for an inlet pressure of up to 12 bar and reduces this to an outlet pressure of 0.7 bar. The closing pressure is 1.1 bar. The COLORADO city water regulator sits in a housing made of UV-resistant ABS, which is closed by a cover when not in use. The hose connection on the inlet side is made using a standard hose coupling.