Powerhouse PH21/27 Parallel Kit For Models PH2100PRI & PH2700PRI Connect any two powerhouse parallel-ready generators to provide extra power with this optional kit Connect two PH2100PRI generators together to get 4,000 continuous watts Connect two PH2700PRI generators together to get 5,000 continuous watts Connect one PH2100PRI generator and one PH2700PRI generator together to get 4,000 continuous watts Generators sold separately.