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Watts Water Hammer Arrestor 1 In MNPT Copper is an essential plumbing accessory that protects against water pressure shock and prevents disastrous water hammer conditions in dishwashers, clothes washers, and quick-closing faucets. With its high-quality copper body and low-lead brass adapter, it ensures durability and long-lasting performance. Its easy installation at any angle makes it an ideal solution for both new and existing plumbing systems. Say goodbye to noisy pipes and costly repairs caused by water hammer damage with the reliable Water Hammer Arrestor from Watts.