用以保持止动环的槽。
合适的止动环见产品表，包括型号和尺寸，可单独提供或安装在轴承上一起提供。
Appropriate snap rings are shown in the product table with designation and dimensions and may be supplied separately or already mounted on the bearing.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
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