VIQUA D4 Whole House Ultraviolet (UV) System 12 GPM 650694-R Selling Unit: Each Type: Ultraviolet System Size/Dimensions: 20.5 x 4 System Capacity: 12 GPM Connection: 3/4 MNPT Maximum Pressure: 125 psi (8.62 bar) Maximum Water Temperature: 104° F (40° C) Cartridges Required: UV Lamp (602805), Quartz Sleeve (602732)