you can use low-pressure water and a non-corrosive degreaser

including model BGM07516BD

Zero Maintenance: Engineered for non-lubricated operation

Key Benefits: Precision Pressure Regulation: Maintains consistent WC (Water Column) settings under varying inlet pressures

it may need to be sourced separately depending on the specific HVAC control application

Honeywell ARR262-S32 Air Reg Els PW 17895 you can use low-pressure waterThe Honeywell ARR262 S32 is a professional grade miniature pressure regulator engineered for precision control in pneumatic and hydraulic systems. Designed with a standard 1 4" NPT inlet, this regulator maintains a consistent outlet pressure range from 0 to 60 PSI, making it a critical component for stabilizing downstream equipment airflow. Built to handle a maximum inlet pressure of 250 PSI, the rugged housing and integrated 0 60# pressure gauge