The Dometic/Sealand VG3 / VHT vacuum switch kit is the genuine replacement vacuum switch for the low-profile VG3 vacuum generator and the VHT vacuum holding tank used in VacuFlush toilet systems. It mounts on top of the tank by pressing into a 1-1/2" tapered sealing grommet, which is included in the kit.
A diaphragm senses the vacuum in the tank: once it reaches approx. 8–10 inHg, the snap-action switch turns the vacuum pump off, and after each flush it switches the pump back on to restore vacuum. A pump that keeps running even though the system holds good vacuum is the typical sign of a failed switch.
Our expert team is available to assist with the selection and installation of marine toilet and sanitation system components. Feel free to reach out with any questions.
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