I obtained small 220V pump from an iron or steam cleaner, not sure. Payed 2 euro on a boot sale. Similar to the ones used in cars, that throw water on the front glass. However i prefer the 220V version cause no messing with transformers and so plus it vibrates instead of rotates, so pumps slowly, exactly what we need. The one i have is something similar to this one , checked it with oil and it works. Believe the flow is adequate for the purpose.