The MILWAUKEE M184-Gallon Water Supply Kit w/ SWITCH TANK offers an easy-to-use interchangeable tank design with no manual pumping. Designed to meet your water supply needs for concrete cutting and coring, the battery-powered water supply delivers instant, constant, and adjustable pressure up to 60 PSI. The 5-mode pressure regulator adjustment knob adjusts the pressure between 20 - 60 PSI for ultimate control. The M18 REDLITHIUM XC3.0 Battery (included) provides you with up to 40 tanks of water delivery per charge.The backpack frame includes a premium adjustable harness and a handle, providing convenient transportation and storage. The 4-Gallon Water Supply is made up of two components - the M18 Powered Base w/ SWITCH TANK and the 4-Gallon Water Supply Tank Assembly w/ SWITCH TANK (49-16-19WS). The Powered Base includes the motor, battery compartment, and REDLINK electronics, while the interchangeable Tank Assembly includes the pump, 10ft hose, and quick-connect coupler. The isolated pump, hose, and quick-connect design allows you to add on tank assemblies for different applications. The M18 Powered Base is compatible with the 4-Gallon Sprayer Tank Assembly w/ SWITCH TANK (49-16-19PS). The M18 4-Gallon Water Supply Kit w/ SWITCH TANK is part of the M18 system, which is fully compatible with over 275 tools.