Bulb burned out? Here is one of the bulbs that Velo has used.

This 24-volt bayonet light bulb uses a two-pin base. It is used on the sightglass on many older Velo filters.

*Note this is the pin version not the threaded version, see 101719 for threaded

This part is known to be compatible with the following machine models: Velo 5 sq meter and up