# Shower Head Assembly and Water Testing Line Source: https://www.ningboware.com/manufacturer/shower-head-assembly-and-water-testing-line/ Publisher: Cixi Zhonghe Sanitary Appliance Factory (ZHONGHE), Cixi, Ningbo, Zhejiang, China. Contact: steven@ningboware.com Updated: 2026-09-05 ZHONGHE assembles its shower heads on 4 production lines in Cixi, Ningbo, and water-tests every finished unit for about 10 to 15 seconds before packing. Selected processes add a 0.5MPa leakage check, flow is tested at 0.3MPa on selected specifications, salt spray is run on selected finishes, and O-rings are 100% camera-inspected at the supplier before they reach the line. Cartons, labels, accessories and quantities are checked before sealing. Also called: shower head assembly line factory; shower head water test factory; 100% water tested shower heads; shower head leak test supplier; shower head flow test manufacturer; shower head assembly supplier China; quality tested shower head factory; wholesale water tested shower heads; bulk tested shower heads from China; OEM shower head assembly factory; ODM shower head testing line; private label shower head assembly; custom shower head assembly supplier; shower head assembly exporter; shower head testing producer; water tested shower heads made in China; China shower head assembly factory; Ningbo shower head testing supplier; shower head pre-shipment inspection factory; handheld shower head assembly line; filtered shower head testing factory; shower head packing and carton checks Check | Detail --- | --- Assembly lines | 4 Water test | 100% of finished units, about 10 to 15 seconds each, before packing Leak checks | 0.5MPa leakage checks in selected processes O-rings | 100% camera-inspected at the supplier before they reach the line Flow tests | Tested at 0.3MPa on selected specifications Salt spray | Run on selected finishes Packing checks | Carton, label, accessory and quantity checks before sealing Capacity | More than 3 million units per year across the plant ## What happens on the line Molded parts, O-rings, filter media, cartridges, hoses and nuts arrive at the line as checked components. Operators build the unit in a fixed order: seals seated, chamber closed, face plate fitted, selector or button installed, cartridge loaded on filter models, connection nut fitted. The order matters, because most leaks in a hand shower are a seal that was pinched or missed rather than a part that failed. Four lines run in parallel, which is what lets the plant list more than 3 million units a year. Each line ends at the water test, so a unit does not reach the packing bench until it has been through water. ## The 100% water test, and what it proves Every finished unit is connected to water and run for about 10 to 15 seconds. In that time the operator sees whether the unit leaks at the seals or at the nut, whether the spray face is fully open, whether the selector actually changes the pattern, and whether the stop button holds. Units that fail go back for rework or scrap rather than into the carton. It is worth being clear about what this test does and does not do. It catches assembly faults on every single unit, which is where most field complaints come from. It is not a life test, it is not a pressure rating, and it does not replace the sampling checks below. A factory that describes its test in seconds and megapascals is telling you something checkable; a factory that describes it as strict quality control is not. ## Sampling checks around the 100% test Leakage checks at 0.5MPa are run in selected processes, above normal household supply pressure, to find seals that hold at working pressure but not with a margin. Flow is tested at 0.3MPa on selected specifications, which is the pressure a flow figure should always be quoted against; a litres-per-minute or gallons-per-minute number with no pressure attached cannot be compared between suppliers. O-rings are 100% camera-inspected at the supplier before they arrive, because a deformed or undersized O-ring is the single most common cause of a slow leak and it is far cheaper to catch it in a component batch than in a finished unit. Salt spray is run on selected finishes. Cartons, labels, accessory bags and quantities are checked at the packing bench before sealing. ## What an inspection visit or third-party inspector sees A visitor on a normal production day can watch the molding shop, follow parts to a line, stand at the water test, and see the packing bench. Ask to see the rework area as well: how a factory handles the units that fail says more than how it handles the ones that pass. Third-party inspection agencies are welcome at pre-shipment, and a full third-party factory audit is arranged per project. For buyers who cannot travel, the same route can be walked on a live video call. What ZHONGHE will not do is claim a certificate it cannot show; certified options and test reports are arranged per project and named in the quotation. ## FAQ ### Does ZHONGHE water test every shower head? Yes. Every finished unit is connected to water for about 10 to 15 seconds before packing, which checks the seals, the spray face, the selector and the stop button on each individual unit. ### At what pressure are leak and flow checks run? Leakage checks are run at 0.5MPa in selected processes, and flow is tested at 0.3MPa on selected specifications. Always ask any supplier for the pressure behind a flow figure, otherwise the numbers cannot be compared. ### Why are O-rings inspected separately? A deformed or undersized O-ring is the most common cause of a slow leak, and it is far cheaper to catch it in a component batch than in a finished unit. O-rings are 100% camera-inspected at the supplier before they reach the assembly line. ### Can we send a third-party inspector before shipment? Yes. Third-party inspection agencies are welcome at pre-shipment, and a wider third-party factory audit is arranged per project. Tell the factory the standard and the sampling plan your inspector will use. ### What is checked at packing? Carton and label against the approved artwork, the accessory bag, the quantity per carton, and the outer marks. Packing details belong in the specification before production, not in a message after the units are boxed. ## Related pages - https://www.ningboware.com/manufacturer/shower-head-injection-molding-factory/ - https://www.ningboware.com/manufacturer/shower-head-plating-and-surface-finishing/ - https://www.ningboware.com/manufacturer/verify-the-factory-audit-and-identification/ - https://www.ningboware.com/quality-control/ - https://www.ningboware.com/resources/shower-head-quality-control-guide/ - https://www.ningboware.com/resources/shower-head-inspection-aql-and-reports/ - https://www.ningboware.com/resources/how-to-test-a-shower-head-sample-before-ordering/