Watts® QT reverse osmosis drinking water systems come from the factory booster pump ready; pumps to boost pressure can easily be installed when greater pressure is needed. QT Booster Pump Retro Kits feature a patent-pending smart sensor, which knows what position the automatic shut-off valve is in to control the pump when greater pressure is required. Kits come with pump, transformer (110 or 220 volt), sensor, connections, tubing and instructions.www.watts.com800-659-8400