This Drayton ZA6 actuator head is designed for use with a 2 port 28mm motorised valve, specifically the ZA6/779-2 model with 6 wires. It is ideal for those needing to control the flow of water in a storage tank water heater. The brand is well-known for its quality products and this actuator head is no exception. The item falls under the categories of standard water heaters, water heaters, heaters & radiators, heating, cooling & air, and home, furniture & DIY. With this Drayton ZA6 actuator head, you can easily and efficiently control the flow of water in your heating system.