The Potterton 3 bar pressure relief valve is a safety device designed for use in Potterton Powermax, Promax, and Promax Er P boilers. Normally located beneath a boiler, within the hydraulics and connected to the outside of a property via a discharge pipe, it works with the expansion vessel and is designed to control pressure in a closed system, relieving a build-up to avoid damage or malfunction.

Brand Name	Potterton