Pipe onigun jẹ orukọ fun paipu onigun mẹrin ati paipu onigun, iyẹn ni, paipu irin pẹlu awọn gigun ẹgbẹ dogba ati aidogba. O ti ṣe ti yiyi rinhoho, irin lẹhin itọju ilana. Ni gbogbogbo, irin adikala naa ko ni idi, ni ipele, crimped ati welded lati ṣe paipu yika kan, lẹhinna yiyi sinu paipu onigun mẹrin f…
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