Tailored for sealed heating and chilled-water circuits, the Flamco Contraflex Expansion Vessel stabilises system pressure in accordance with EN 12828 using a durable rolling-diaphragm design.

A nitrogen pre-charge maintains set pressure for longer, while each vessel is factory tested for reliability. The flexible rubber diaphragm's rolling action delivers smooth expansion control across demanding duty cycles.

For use in potable water, or fresh-water installations.

The Airfix D expansion vessels operate in such a way that the water flows right through and they are continuously flushed with fresh water from the mains.

This prevents tepid, stagnant water from collecting in the vessel in which bacterial growth could occur.

Therefore, users can be assured of high quality potable water.

Applying an Airfix D expansion vessel to a water heater prevents the opening of the safety group or safety valve each time the potable water is heated.

The Flamco Airfix D 8 Expansion Vessel - 8 Litre - 4 bar. is a Expansion Vessel item.

Maintain potable water hygiene and stable pressure with the Flamco Airfix A flow-through expansion vessel for mains-fed potable and fresh-water systems.

For use in potable water, or fresh-water installations.

The Airfix A expansion vessels operate in such a way that the water flows right through and they are continuously flushed with fresh water from the mains.

This prevents tepid, stagnant water from collecting in the vessel in which bacterial growth could occur.

Therefore, users can be assured of high quality potable water.

Applying an Airfix A expansion vessel to a water heater prevents the opening of the safety group or safety valve each time the potable water is heated.

A synthetic flow-through device installed in a standard T-piece (not included) diverts part of the line flow through the vessel to prevent stagnation. This reduces nuisance safety-valve lift on water heaters and avoids waste, while keeping water continuously refreshed.

• Flow-through design helps suppress bacterial growth
• Protects safety devices by reducing valve lift and leakage risk
• Taste/odour neutral butyl diaphragm for potable use
• Corrosion-resistant internal coatings on water and nitrogen sides

Factory nitrogen pre-charge supports long-term pressure stability. Internationally approved and certified. Compatible with Airfixcontrol for quick annual pre-charge checks.

The Flamco Airfix P DHW Expansion Vessel - 24 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

The Flamco Airfix P Expansion Vessel - 50 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

The Flamco Airfix P Expansion Vessel - 60 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

The Flamco Airfix P Expansion Vessel - 100 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

The Flamco Airfix P DWH Expansion Vessel - 200 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

The Flamco Airfix P DHW Expansion Vessel - 300 Litre - 2.7 bar. - Horizontal is a Expansion Vessel item.

For mounting expansion vessels without clench ring (2 - 35 litres) to the wall.

The Flamco Band Fitting for Airfix Potable Vessel -

Flexcon intermediate expansion vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. System water flows from the installation into the top of the vessel. From the bottom of the vessel, significantly cooler water is fed into the expansion vessel.

Flexcon intermediate expansion vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. System water flows from the installation into the top of the vessel. From the bottom of the vessel, significantly cooler water is fed into the expansion vessel.

Built for EN 12828 heating and chilled-water systems, Flexcon Premium Expansion Vessels stabilise pressure by absorbing thermal expansion in sealed LPHW/CHW installations.

The range introduces a lightweight TPO (thermoplastic polyolefin) diaphragm on 12–35 Ltrs models, combining high flexibility with very low permeability. Using up to 50% less material cuts raw-material use and transport energy, while FSC-certified packaging further reduces CO₂ impact.

• Sustainable design — lighter TPO membrane; FSC-certified packaging
• Long service life — 15-year warranty and factory functional testing
• Low permeability — helps pre-charge hold for longer
• Nitrogen filled — limits corrosion and pressure loss vs air

Construction features include a zinc-plated steel clench ring that evenly clamps the diaphragm for a perfect seal, pre-coated vessel halves (no clamp-ring corrosion or thermal shock to the diaphragm), a countersunk nitrogen valve protected by a recycled-plastic cover plate, and a ribbed, preformed rolling diaphragm that resists sticking. An uncoated taper water connection thread eases watertight installation; the vessel is finished in a gleaming epoxy-powder coat.

Vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. System water flows from the installation into the top of the vessel. From the bottom of the vessel, significantly cooler water is fed into. Capacity 200 Ltr.

Vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. System water flows from the installation into the top of the vessel. From the bottom of the vessel, significantly cooler water is fed into. Capacity 100 Ltr.

Vessels to protect Flexcon expansion vessels on elevated temperature systems. The vessels are fitted in between the expansion vessel and the system return. System water flows from the installation into the top of the vessel. From the bottom of the vessel, significantly cooler water is fed into. Capacity 100 Ltr.