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There are pumps on the market that are self-priming and can run dry indefinitely without doing damage to the pump.
SEAFLO 12V 5.5 GPM 60 PSI Water Diaphragm Pressure
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SEAFLO 12v Diaphragm Pump 3GPM 60PSI w/ 8L Pressure Tank Model
12 Volt, 7.0 GPM, 60 PSI positive displacement pump Self-Priming and capable of run dry operation Continuous duty motor Built-in relay switch 4 Year
SEAFLO 53-Series Water Pressure Diaphragm Pump - 12V DC, 7.0 GPM, 60 PSI
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SEAFLO 12v dc low power transfer booster pump for shower