The trailing '1 0 false' are parameters that correspond with (in order):

The number of items to give
The quality of the items (no effect on the vaults)
Whether to give the blueprint or the item (false for item, true for blueprint)

Tavan's Water Pump

cheat giveitem "Blueprint'/Game/Mods/PoweredPlumbing/PrimalItemStructure_TavansPump.PrimalItemStructure_TavansPump'" 1 0 false

Tavan's Cement Mixer

cheat giveitem "Blueprint'/Game/Mods/PoweredPlumbing/PrimalItemStructure_TavansCementMixer.PrimalItemStructure_TavansCementMixer'" 1 0 false

Tavan's Pressure Cooker

cheat giveitem "Blueprint'/Game/Mods/PoweredPlumbing/PrimalItemStructure_TavansPressureCooker.PrimalItemStructure_TavansPressureCooker'" 1 0 false