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Dan and Kika on Uma test seven 12V freshwater pumps to solve a noise problem: their installed Jabsco Parmax HD5 measured 84 decibels, turning the head compartment into a vibrating echo chamber.1:05 The seven pumps under test are: the original Jabsco Parmax HD5 (installed, noisy), a second brand-new Jabsco Parmax HD5 (to check whether the first is defective), a Jabsco Parmax HD5 Hotshot (saltwater-rated variant), a Jabsco V-Flow 5 (variable-speed, previously installed), a Seaflow 42-series diaphragm pump (~$70, 11 LPM, popular in the RV market), a Johnson AquaJet 4.0 (15 LPM, U.S.-made, quick-disconnect fittings), and a Marco impeller pump (Italian-made, gear-type impeller with a pressure-smart control module, smallest body but heaviest).1:59 The test rig runs each pump through a shared plumbing circuit — bucket, filter, shutoff valve, faucet, two showerheads, and a return line — measuring decibels with a phone app at close range, amperage, flow rate across multiple simultaneous fixtures, and heat buildup over extended runtime.18:20 Dan notes the Marco and Seaflow are the only variable-speed pumps and the only ones that may not require an accumulator tank.2:52 PEX quick-connect compatibility and housing corrosion resistance (steel vs. brass) factor into the evaluation alongside noise.5:57

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