If you have access to a hose bib or have access to a sink and own our Hot Water Sink Adapter accessory, you do not need the pump to pressurize your RinseKit. The Pressure Booster Pump allows you to pressurize your RinseKit when you do not have access to a hose bib or sink. It is also great for adding additional pressure to your RinseKit if you have low water pressure or want to get the maximum spray time from your unit. Users who add additional pressure into their RinseKit after normal filling, get approximately 25% more spray time!