Our Holding Tanks come complete with everything you need for installation. They make a great fit with our commercial line of R/O units, making them plug and play. Each tank comes with upper and lower floats, Sta-Rite stainless steel submersible pump, high pressure switch, pressure gauge, and 20 gallon pressurized tank. These Duke tanks have a twist off top, making them easy to service and clean. The 150 gallon model also fits through a standard door.