High-quality replacement butyl membrane designed for Varem 300 L vertical pressure vessels. Engineered for reliable pressure separation in pump systems, autoclaves and hot water installations, this diaphragm restores original tank performance and helps prevent pump short-cycling and waterlogging. Ideal for professional plumbers, service technicians and facilities maintenance teams seeking a direct-fit spare part for several Varem series.

Compatibility & key specifications

• Compatible with Varem 300 L vertical vessels including MAXIVAREM LS, INTERVAREM LS, PLUSVAREM, INOXVAREM, ULTRAVAREM and ZINCVAREM families.
• Material: Butyl rubber membrane — durable, flexible and suitable for potable and non-potable systems when used with the appropriate tank lining.
• Typical system parameters: designed for tanks pre-charged around 2 bar and system pressures up to common Varem ratings (~10 bar); suitable temperature range for standard Varem water-line vessels.
• Direct replacement spare part intended to restore factory diaphragm performance and longevity.

Benefits & installation notes

Replacing the membrane rejuvenates tank capacity and pump cycle stability without replacing the entire vessel — a cost-effective service item for routine maintenance. The butyl diaphragm resists deformation and offers long-term durability in heating, domestic water booster and irrigation systems. Installation is straightforward for trained technicians: depressurize the tank, remove the flange, fit the new membrane and re-pressurize to the recommended pre-charge. Always follow Varem installation guidance and confirm vessel model before fitting.