A metering device with a protective sleeve or cover is described. The metering device adjusts a flow of a fluid. The metering device includes a valve, a neck, and a stem. The neck includes an opening to receive the stem in a rotational engagement. The stem is engaged to the valve to adjust the valve. The sleeve or cover encloses or covers the opening. The sleeve includes a first opening and a second opening. The first opening attaches to the neck. A knob inserts through the second opening of the sleeve. The knob attaches to the stem, and rotating the knob adjusts the valve.