The Reflex Refix DD 33 pressure expansion vessel is a flow-through membrane vessel designed for heating systems, potable water supply, and pressure boosting. Thanks to its flow-through design with a High-Flow star and the included G 3/4" T-piece, it ensures high flow rates without unnecessary pressure losses. The non-replaceable butyl bladder membrane meets KTW-C and W270 requirements for potable water, and both the internal and external surfaces are treated according to KTW-A for enhanced corrosion protection. The vessel is manufactured according to DIN EN 13831 and tested according to DIN 4807 T5, suitable exclusively for cold water piping.