SL225 API 8c Wellhead Rolling Rotary Hose Hook Swivel for Oil Drilling Rig Design FeaturesSwivels are divided into two types: conventional swivels and dual‑purpose swivels. A dual‑purpose swivel integrates a conventional swivel and a spinner as one unit.The swivel complies with API Spec 8C PS1 product specification issued by the American Petroleum Institute, and has obtained the API product certificate, permitting the use of the API monogram.The washpipe packing assembly