How often should I replace the inlet hoses on my washing machine?
You should replace inlet hoses after 5 years of use to reduce the risk of hose failure. You should also periodically inspect the hoses and replace them if you find any bulges, kinks, cuts, wear, or leaks. Record the hose installation or replacement dates on the hoses for future reference.
From the official Whirlpool WFW9400SW00 Washing Machine manual, page 8
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