Keurig kit with water filter cartridge KQ8 filter cartridge, valved head, angle stop valve, poly tube, 3/4-in FGH Backflow and screw for the B150, B155, B200, B3000, B3000S, B3000SE, K155, K150 as well as K150P and mountain bracket and self tapping screws. This kit is ideal for the Keurig commercial machines Feature This set includes everything you need to install a Keurig brewer B150, B145, B155, B200 or B3000; will also fit new models K150, K150P, K155, K3000 Backflow means the undesirable reversal of flow of a liquid, gas or solid into the potable water supply — A backflow preventer keeps this from happening. Green Mountain/ Keurig kit with KQ8 and 3/4 FGH Backflow Kit Includes: Head w/Bracket Filter Cartridge Inlet Ball valve Angle stop valve 3/8-in M Comp x 3/8-in Fe Comp x 1/4-in QC 15 Ft Tubing