The Dewalt 487296-00 O-ring rotary hammers and drills models. This is a small circular part that plays a very important role in providing airtight or hydraulic seals within the tool. It seals against the escape of air or oil which is crucial in maintaining pressure and efficient working of the hammering mechanism. A good O-ring is very important to ensure that power is supplied in a constant manner and also to avoid internal damage. This simple replacement can go a long way in enhancing the performance and effectiveness of the tool at the workplace.
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