2-20 O Ring Suitable For rotary hammer Machine in Dongcheng / DCK /Powertex / DCA / All Imported 2-20 Model
Brand : Generic
Suitable For : Dongcheng / DCA / DCK / Xtrapower / Powertex / All Imported 2-20 Model
O ring helps to the striker was airtight in the piston.
so please read the user manual to avoid that.