Sealand 385311216 Vacuum Switch for VG4
If your VacuFlush pump keeps running even though the toilet already has good suction, the vacuum switch is usually the culprit, and this snap-on replacement for the VG4 vacuum generator is built to solve exactly that problem. It mounts directly to the corner of the vacuum tank with four screws, and as the tank pressurizes, an internal diaphragm responds to the changing vacuum level. Once the system reaches the proper vacuum range, the switch trips and shuts the pump off automatically, then resets and restarts the pump once vacuum is released by flushing.
This assembly comes factory preset and works on dual voltage systems, so there's no need for manual calibration after installation. It's designed specifically for VG4, JW, and JS Series vacuum generators, making it a direct fit for owners maintaining Sealand or Dometic sanitation systems on boats or RVs. Because the switch is a sealed, complete unit, replacing a failing one is generally a simple bolt-on job rather than a full teardown of the vacuum generator.
Switch failure is one of the more common reasons a vacuum generator runs longer than it should, straining the pump motor and wasting energy. Installing a fresh, correctly calibrated switch like this one restores normal cycling behavior and helps protect the rest of the vacuum system from unnecessary wear.
Key Features
- Complete snap-on vacuum switch assembly
- Factory preset for accurate vacuum shutoff
- Dual voltage compatibility
- Includes mounting screws for installation
- Diaphragm-actuated snap-action design
Applications
- VG4 vacuum generators
- JW-Series vacuum generators
- JS-Series vacuum generators
- VacuFlush marine toilet systems
- Marine and RV vacuum sanitation systems
Specifications
- Part number: 385311216
- Legacy Sealand number: 311216
- Switch type: Snap-on, diaphragm-actuated
- Voltage: Dual voltage, factory preset
- Mounting: 4-screw attachment to vacuum tank
- Function: Automatic pump shutoff at proper vacuum level
- Wiring: Connects at the B terminals
Frequently Asked Questions
Q: How do I know if my vacuum switch has failed?
A: The most common sign is a pump that continues running even though the toilet already has proper vacuum, which usually points to a bad switch or a significant vacuum leak elsewhere in the system.
Q: Does this switch require calibration after installation?
A: No, it comes factory preset, so it's ready to operate correctly once it's mounted and wired.
Q: What tools are needed to install this switch?
A: Installation typically only requires a screwdriver, since the assembly mounts to the tank using the four included screws.
Q: Is this switch compatible with both 12V and 24V systems?
A: Yes, it's built as a dual voltage switch, so it can be used across different system voltages without needing a separate part number.
Q: What vacuum range does this switch typically operate within?
A: It's designed to trip once the tank reaches approximately 8 to 10 inches of vacuum, shutting the pump off at that point.
CLRMarine
