Speedfit Underfloor Heating Pump Pack Manufactured in DZR brass, the pack consists of a pump, mixing valve and overheat temperature thermostat. Hot water is taken from the boiler, mixed to the required temperature and circulated via the manifold to the heating circuits, the temperature and volume of water is constantly altered to maintain the requirements of the system. Flow temperature can be altered by turning the hand wheel on the mixing valve unit. The Pack is light and compact so a wall bracket is not needed and flat face unions make for an easy connection to the manifold