A high-quality, piston-type mechanical water hammer arrestor typically has a lifespan ranging from 10 to 20 years, depending heavily on your home's water chemistry and operating pressure. Over years of continuous exposure to hydraulic shock waves and mineral-heavy water, internal O-rings, seals, or pistons can eventually wear out or lose elasticity, causing the arrestor to become waterlogged and ineffective. Verification: Monitor plumbing noise levels over time and replace arrestors if banging sounds begin to return.
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