20" X 4.5" Big Blue Twin Water Filter Housing with StandCTO Carbon Block + Pleated  Sediment    Port Size 2x 1" -3/4" included  Kit includes 20" Big Blue Twin Water Filter Housing with Stand  CTO Carbon Block + Pleated  Sediment   Original  Output port size   1" (25mm)  Wrench FREE ADAPTER COMES WITH PACKAGING 2X 3/4"