A na-eji waya jumper eme ihe mkpuchi iji gafee ebe ọrụ n'oge mmezi ahịrị na nrụzi nwa oge ma ọ bụ mberede.
1. Dabara adaba na: ASTM F2321 ọkọlọtọ
2. Mgbe ị na-etinye ma na-ewepụ ihe mgbochi jumper, a ga-eyi ihe mkpuchi roba kwesịrị ekwesị iji wepụ ihe mgbochi ahụ.