rotary drilling hose, I.D. 51mm---152mm rotary drilling hose Made according to API Spec. 7K . ISO9001:2000 rotary drilling hose, I.D. 51mm---152mm rotary drilling hoseAPI 7KConstructionReinforcement: Two high strength steel cablesCover: Ozone, petroleum and abrasion resistanceTube: Oil resistant for petroleum drilling fluidsEnd Fittings: API male nipples, threaded or buttweld hammerunions, ...