M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply Kit

Our M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply kit delivers the industry’s first 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 provides you with up to 12 tanks of water delivery per charge. The 4-gallon water supply tank features a dual diaphragm pump for increased durability and longer pump life. The tank also has a wide mouth opening for easier pouring and a strainer that filters debris from getting into the tank. The backpack frame includes wide straps and a handle providing you with convenient transportation and storage. The 4-Gallon Water Supply is made up of two components – the M18™ SWITCH TANK™ Powered Base and the SWITCH TANK™ 4-Gallon Water Supply Tank Assembly. The Powered Base includes the motor, battery compartment, and REDLINK™ electronics, while the interchangeable Tank Assembly includes the pump, 10ft hose, and quick-connect. The isolated pump, hose, and quick-connect design allows you to add on tank assemblies for different applications, eliminating cross-chemical contamination. It also provides you with the ability to replace the tank assembly at a lower cost of ownership compared to replacing the entire water supply. The Powered Base is also compatible with the SWITCH TANK™ 4-Gallon Concrete Sprayer (49-16-28CS) and 4-Gallon Sprayer (49-16-28PS) Tank Assemblies. The M18™ SWITCH TANK™ 4-Gallon Backpack Water Supply is part of the M18™ system which is fully compatible with over 175 tools. In addition to the backpack water supply, the kit includes one M18™ REDLITHIUM™ XC3.0 Battery and an M18™/M12™ Multi-Voltage Charger.


Interchangeable Tanks,
No Manual Pumping


  • Interchangeable tank design isolates the pump, hose and quick-connect, separating wearable components from the M18™ SWITCH TANK™ Powered Base
  • Eliminates cross-chemical contamination and delivers lower cost of ownership


  • Powerful pump and motor deliver instant and constant pressure up to 60 PSI
  • 5-mode pressure adjustment knob adjusts pressure between 20-60 PSI, delivering greater flow rate control during cutting and coring applications
  • Up to 1.13 gal/min flow rate


  • M18™ REDLITHIUM™ XC3.0 Battery delivers up 12 tanks of water delivery per charge


  • Add-On, Replace and Interchange SWITCH TANK™ Concrete Sprayers and Water Supply Tanks
  • Compatible with SWITCH TANK™ Concrete Sprayer and Pesticide Tank Assemblies
  • Instant, Constant and Adjustable Pressure for Ultimate Control
  • Interchangeable Tanks, No Manual Pumping
  • OSHA Table 1 Compliant when Concrete Cutting and Coring
  • Run-time: Up to 12 tanks per charge with M18™ REDLITHIUM™ XC3.0 Battery
  • Strainer to Filter Debris
  • Up to 12 Tanks Per Charge
  • Up to 60 PSI
  • Wide Mouth Opening for Easier Pouring
  • Wide Straps and and handle for convenient transport and storage
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Battery Specifications

Voltage 18V
Battery Type 18 Volt Lithium Ion

Product Specifications

Tool Warranty 3 Year Base, 1 Year Tank, 3 Year Battery
Power Source Cordless
Length 10 in
Weight 18.45 lb
Height 21.75 in
Width 13 in
Battery System M18