With an electro-magnetic clutch you will have pumping power whenever needed, at the push of a button , without being at the pump. Combined with a vacuum switch (recommended for bilge pump application), the clutch will automatically disengage whenever the pump starts priming air, thereby preventing dry running and pump damage. Automatically controlled pumps are available in sizes from 1" to 2 1/2" (20 L/Min to 625 L/Min), with clutches in 12 or 24 volts. Wearing parts are easily replaceable and service kits are available for all standard models.