Not to be confused with the Diverter Cartridge. This cartridge turns the water on and off and adjusts the temperature.
Replace if water is dripping from the mixer knob.
Replace if water is dripping from the end of the spout. NOTE: not to be confused with water draining from the spout after the valve is closed.
4020 main valve
Changed both the diverter and mixing cartridges. We live in Mexico and our cistern water pump got dirt in it so it contaminated the Dishmaster. Easy change out procedure and now it’s perfect.
P4020 Mixer Cartridge
I grew up using dishmaster had my grandmother's house. So when I bought my house 35 years ago the first thing I did was install a dishmaster faucet and I've been using them ever since. Easy to get parts easy to service.