The new technology built into this pump senses the water flow and adjusts the motor speed to give you an even flow and pressure without cycling.  Delivers up to 4.5 gallons of water per minute at up to 30 psi. 30 PSI Demand flow 4.5 GPM 12 VDC 10.0 AMP motor VSD sensor Variable speed control Santroprene/EPDM Chemical resistant diaphragm pump Controls pressure by changing speed Eliminates need for accumulator tank Flojet 04300504A, Electric Pump 5.0 GPM 45 PSI 12V,  9.101-209.0  B0722WHSD3,  UPC 705474203017,  R4420743F

R4400 Series DC Quad Pump VSD Module

The R4400 DC VSD provides pulse free constant pressure operation on any DC voltage from 10-29 volts. Operation from no flow to maximum flow is system controlled, eliminating unwanted pump cycling and the need for an accumulator tank. The system provides reduced amp draw and quite operation when less than maximum flow is required. Standard features include soft start to reduce splash, thermal overload, over-current and reverse polarity protection.

• Constant Pressure Operation
• Variable Speed Control
• Solid State Pressure Sensor
• Nearly Silent Operation / No Cycling
• Operates on 12V DC or 24V DC
• Controls Pressure by Changing Motor Speed
• Self-priming / Runs Dry Without Damage
• No Accumulator Tank Needed
• CSA Listed / EN ISO 8846 Marine / C.E. Certified
• Patent Pending