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https://www.gardenspareparts.co.uk/
DeWalt DCH SDS Rubber O Ring Catchring DCH143 DCH243 DCH253 DCH273 DCH363
This rubber ring fits between the beat piece and the ram assembly. This provides an airtight cushion as the ram pushes into the spindle. This piece will wear down, and will need replacing as part of proper maintenance for your SDS.
Please see suitable models below: