The Zilmet Hydro-Pro expansion vessel offers a compact design with a seamless diaphragm that doesn't stretch or crease. There are no bubbles or corners to trap sediment, which helps to inhibit bacterial growth. The Hydro-Pro has international approvals allowing its use with potable water.

• Protected pre-charge valve
• Durable steel tank
• Deep drawn steel shell for extra strength
• MIG welding process eliminates interior rough spots and sharp edges preventing damage to diaphragm and liner
• Pre-pressurised air chamber
• The butyl diaphragm isolates water from air
• Exclusive internal epoxy-polyester coating
• No rusting
• Mild steel connection