400G Pump Diaphragm

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The 400 GPD pump Diaphragm plays a crucial role in any 400 GPD reverse‑osmosis (RO) booster pump. It seals the valve block, the lower base, and the pump‑head cover — while also separating the water chamber from the motor assembly.

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Because it creates this sealed barrier, the diaphragm prevents water from reaching the motor; this safeguards the pump’s electric components and avoids potential damage. Additionally, by maintaining a proper seal and correct pressure, the diaphragm ensures that your RO system delivers consistent flow and pressure, which is essential for optimal membrane performance.

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Over time, diaphragms tend to lose elasticity or suffer wear, which can cause pressure loss or leaks between the base and cover, and even allow water ingress into the motor compartment. Replacing a worn diaphragm with the 400G Pump Diaphragm restores proper sealing, recovers pressure levels, and prevents leakage or motor damage.

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Made from non‑porous, chemical‑resistant vulcanized rubber, this diaphragm withstands the demands of repeated cycles in RO setups. Under normal household use, it delivers reliable service for about 3–4 years before needing replacement.

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In short: installing the 400G Pump Diaphragm ensures safer, more efficient, and longer‑lasting RO booster pump performance — whether you run your system at home, in a water shop, or for light commercial purification.

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Key Features & Benefits

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• Direct replacement for 400 GPD RO pumps — ensures compatibility and correct fit.

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• Seals valve block, base, and pump cover — prevents water leakage and protects motor from moisture ingress.

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• Maintains stable pressure and flow — essential for consistent RO membrane performance.

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• Made of durable, chemical‑resistant rubber — resists wear and chemical exposure for long service life.

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• Easy to replace — keeps maintenance simple, making it an ideal part for routine RO pump upkeep.

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• Extends pump life and reliability — prevents motor damage, reduces leaks, and maintains performance over time.

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Typical Applications & Use Cases

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You should consider using the 400G Pump Diaphragm for:

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• Maintenance or repair of 400 GPD RO booster pumps in domestic water‑purification systems.

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• Water shops, bottled water facilities, or small commercial RO setups that require stable and safe performance.

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• Regular replacement schedules (every 3–4 years) to avoid pump wear, leaks, or motor damage.

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• Upgrading older or worn-out pump heads to restore pressure, efficiency, and system reliability.

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• Any clean-water filtration system where a 400 GPD pump is used (e.g., under-sink RO, countertop purifiers, commercial dispensers).

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