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Isu takazvipira kupa zviri nyore, kuchengetedza nguva uye kuchengetedza mari imwe-yega yekutenga sevhisi yemutengi weZvinhu,Graphited Ptfe Packing, Dura Mahara Asbestos Mucheka Une Aluminium, Yakarukwa Packing, Aggressive mutengo nemhando yepamusoro uye inogutsa tsigiro inoita kuti tiwane mamwe vatengi.tinoshuvira kushanda pamwe chete newe uye kukumbira zvakajairika kuwedzera.