The Gold Series Pumps are the most reliable pumps in the RO industry. The precision bypass maintains a constant, safe outlet pressure regardless of changes in incoming city water pressure. These pumps are the quietest performing pumps available. Features: Ultra Quiet operation Longest life pump in the industry Flow up to 100 GPDOne-piece solid diaphragm reduces leak points Corrosion resistant motor Built in bypass Specifications: 24 VAC Up to 50 GPD membranes 90 psi bypass Use with 60-044 transformer