4 gpm 4000 psi Pressure Washer Portable Cart Cold Water Pull Start EB4040HC-2 SUCTION / SUPPLY The injector contains a check

The injector contains a check valve to prevent water from flowing into the chemical container while in high-pressure mode

That is the only difference

inlet qc fitting

This unit does have an external bypass unloader

4 gpm 4000 psi Pressure Washer Portable Cart Cold Water Pull Start EB4040HC-2 SUCTION / SUPPLY The injector contains a checkPortable cart cold 4 GPM 4000 PSI pressure washer EB4040HC 2 with Cat Pump 4 gpm 4000 psi Honda GX390 13 hp Cat Pump V belt aluminum frame 50 mesh inlet filter, commercial unloader, low oil shutdown, no flat tires, thermal relief valve, gun wand assembly with quick connects, 50' high pressure grey hose with quick connects, 5 quick connect nozzles, 20% high draw chemical injector assembly with quick connects. We highly recommend adding the best high