Single valve ready to use sprayer

A sprayer head assembly for dispensing a chemical stored in a container;

• the sprayer head assembly comprising:
• a body that includes a chemical passage that is communication with a cavity in the container, a carrier fluid passage that is in communication with a carrier fluid source;
• a vent passage that is in communication with the cavity in the container, and a bore formed that is in communication with the chemical, carrier fluid and vent passages;
• and
• a valve moveably positioned at least partially within the bore, the valve defining, at least in part, a first passage and a second passage, the first passage and the second passage merging at the valve, the first passage being configured so as to be in communication with the chemical passage when the valve is in an open position, the second passage is configured so as to be in communication with the carrier fluid passage when the valve is in the open position, the first and second passages also configured so as to not be in communication with the chemical and carrier fluid passages when the valve is in a closed position;
• the valve further comprising one or more sealing portions positioned on the valve so as to block both the chemical, the carrier fluid and the vent passages when the valve is in said closed position;
• and
• wherein the valve is configured to rotate about an axis that extends in a generally vertical direction and wherein the bore includes lower surface that includes a counter bore and the valve includes valve stem configured to fit within the counter bore.