Nkọwa dị mkpirikpi:

N'ihi na teepu mmiri na-ekpuchi mmiri butyl nwere ezigbo ihe mkpuchi mmiri na-egbochi mmiri, ọ na-arụkwa ọrụ dị mkpa n'inye nchebe mmiri.5cm*5m butyl waterproof teepu bụ nke a na-ejikarị eme ihe.