A Multiport valve can leak for several reasons. Below are some of the most common:
• Faulty O-ring – The O-rings in a Multiport valve can become brittle with age and use, causing them to crack or break resulting in a leak.
• Loose connections – If any valves or joints within the system are not adequately secured, it will allow water to escape from your filter tank and cause leaking.
• Damaged parts - Rusting, cracking or warping of internal components can lead to leakage when under pressure.
In order to fix this issue, inspect all seals and connections on the filter system for damage or wear before replacing any faulty parts as required.