Hello, which rubber ring fell off? If this is where the vacuum tube is connected to the water tank, you need to remove the vacuum tube and reinstall it. When disassembling, be careful not to dislocate the rubber ring in the water tank!
Recommended "Dr. Sun" solar energy, three warehouse models (no need for water level probes and solenoid valves), heating and hot water utilization rates are fast in rainy weather, and the after-sales service The rate is also greatly reduced, saving time. It also saves electricity. This model only takes 20-30 minutes to heat without sunlight, while a single warehouse takes 2-3 hours.