The Hamilton SV-542 is the correct replacement saddle valve for the following humidifier models:
The Hamilton Saddle Valve for 200D, 400D & 800D SV-542 is a replacement saddle valve for the Hamilton Model 200D, 400D, and 800D Humidifiers. This SV-542 saddle valve is used to supply cold water within your humidifier and is also known by part number M-542. This saddle valve replacement is a genuine Hamilton humidifier replacement part and helps your 200D or 800D humidifier operate at maximum efficiency.
Hamilton Saddle Valve for 200D, 400D & 800D SV-542 specifications: