Anti-Legionella Flow Thru Expansion Tank

Suitable for constant pressure water systems seeking to store water without the risk of stagnation.


Anti-legionella expansion tank, available in both composite material and steel. All tanks feature Flow-Thru™ technology which assures that the system will provide the freshest water quality possible by simply eliminating stagnation.

The Flow-Thru™ connection diverts system water into, and more importantly out of the tank while the pump is running. This constant flushing action assures that the water in the tank remains as fresh as possible and eliminates the possibility of stagnant water during normal system operation.

All tanks incorporate proven patented controlled action diaphragm (CAD-2). CAD-2’s steel clench ring regulates movement and prevents the diaphragm from rubbing against the tank wall. The tanks are quality tested at several stages on the production line to ensure the structural integrity of every tank.

Features and benefits:

  • Patented Flow-Thru Technology for freshest water.
  • Flow-Thru™ technology assures total recirculation of the tank’s water content.
  • Available in composite material and steel.
  • Patented CAD-2 diaphragm technology.
  • No stagnation.
  • Patented Watervane, total recirculation of the water.
  • Leak-free air valve cap sealed with closed-cell foam.
  • Comprehensively tested.
  • No maintenance.
  • CE marked, ACS and WRAS approved.


Suitable for constant pressure water systems seeking to store water without the risk of stagnation.

General information
Specification data - Expansion vessels

Product Reference

Anti-Legionella Flow Thru Expansion Tank

Sub-sink system


Composite. Nominal volume: 60 L. Size: 65 x 42.13 cm.


Composite. Nominal volume: 80 L. Size: 86.51 x 42.13 cm.


Composite. Nominal volume: 150 L. Size: 77.44 x 61.77 cm.


Composite. Nominal volume: 200 L. Size: 109.91 x 54.56 cm.


Steel. Nominal volume: 80 L. Size: 73.56 x 40.69 cm.


Steel. Nominal volume: 170 L. Size: 94.33 x 52.96 cm.


Steel. Nominal volume: 325 L. Size: 114.94x 66.03 cm.


Steel. Nominal volume: 450 L. Size: 150.49 x 66.03 cm.

Standard product features

Technical characteristics:

  • Nominal volume: 80–450 L (steel), 60–200 L (composite), type dependant.
  • System connection: 1 1/4” BSP / NPT.
  • Maximum working pressure; 8.6 bar / 125 psi.
  • Maximum working temperature: 90°C / 194°F (steel), 49°C / 120°F (composite).