Abstract: An apparatus for maintaining a continuous supply of cementitious material such as stucco or plaster on the hawk of a workman skilled in applying said materials to surfaces with a trowel. Cementitious material stored in bulk in a hopper remote from the workplace is pumped from said hopper through hose to the hawk of the skilled workman. The flowing lines are free of restrictions or valves and the flow is metered at its source by means of a radio transmitter controlled by the workman applying the cementitious material. Said radio transmissions activate the flow according to the needs of the workman.