1. -umuyoboro wicyuma udafite icyuma ASTM A53 GR.B, ibyuma No.: SA53B, ibisobanuro: 1/4 ″ -28 ″, 13.7-711.2mm 2. Umuyoboro wicyuma udafite icyerekezo cyo gukora ubushyuhe bwinshi: ASTM A106GR.B, nimero yicyuma: SA106B, ibisobanuro: 1/4 ″ -28 ″, 13.7-711.2mm 3. Umuyoboro w'umuyoboro API SPEC5L, ibyuma No.: B, X42, X ...
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