The SL series drilling swivels were developed to provide the market with more reliable technology and more hoisting performance. Modular design adopted. Box type of packing and flushing pipe could be replaced without remove rotary hose and goose neck. Special designed wireline channel on the top of goose neck, which is easy to implement well test and well logging operations. Included but not limited by the advantages mentioned, SL series of swivels might be your best choice.