Replacement diaphragm membrane designed for Varem pressure/expansion vessels in the 60–100 L range. Ideal for restoring proper pump cycling, reducing short-cycling and stabilizing system pressure in domestic and light commercial hydro-pneumatic systems. Compatible with Varem MAXIVAREM/AQUAVAREM series models that use replaceable membranes for 60 L and 100 L tanks.

Manufactured from industry-standard elastomers: EPDM and NBR options are commonly used for longevity, chemical resistance and potable-water compatibility; some Varem product lines also use butyl-type membranes depending on the model. Choosing the correct material ensures resistance to aging, pressure cycling and temperature exposure.

Key technical characteristics: designed to operate in typical Varem expansion vessels with working pressures up to 10 bar and liquid temperatures up to approximately 99 °C (check tank model specifications for exact limits). The membrane is shaped to provide a reliable air/water separation, smooth pump start/stop behavior and extended service life when installed and pre-charged correctly.

Features & benefits

• Direct replacement for 60–100 L Varem tanks — restores correct pre-charge and volume control.
• Available in EPDM/NBR (select per application) for potable water or aggressive media compatibility.
• Improves pump performance, reduces wear and energy waste from cycling.
• Made to OEM dimensions for secure fit and simple installation.
• CE-marked components and manufactured to Varem quality standards (verify model-specific approval). ([varem.com](https://www.varem.com/en/prod/vertical-pressure-vessels/?utm_source=chatgpt.com))