The dribble when the shower head is off is intentional by design to try to keep the temperature constant, to lessen the chance of a too cold or too hot blast when you switch the water back on. It's not 100% effective and in my opinion it wastes some precious water when you are boondocking with a limited water supply.
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2020 Sunseeker 2440DS on 2019 Ford E-450, Trekker cap, Topaz paint
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