gear pump ,melt pump,many kinds of size and model for metering pump,it almost can use for all row material ,and make sure the

melt pump:

many kinds of size and model for metering pump,it almost can use for all row material ,and make sure the pressure steady.

melt pump get through the pressure sensor and make sure the material is  steady output,adjust extruder speed and keep pressure steady.

Melt pump for extruder