This is a 28mm 2-port valve body designed for use with Drayton ZA6 and British Gas BGMVSP-9 head. It is a high-quality product from Drayton, a well-known brand in the industry. This valve body is specifically designed for storage tank water heaters and falls under the category of standard water heaters. The product is ideal for those who are looking for a reliable and durable valve body to regulate the flow of water in their heating system. With its sturdy construction and efficient performance, it is sure to meet your heating needs. Upgrade your water heater system with this top-quality valve body from Drayton.