مهندس بترول - TOTCO RING A Totco ring is not really a sub, but it is included here for convenience. It is a small insert that is placed inside the drill string
![Jual Baffle Plate Ring 6-5/8" Drill Pipe Float Valve 5F6R 5F-6R - Jakarta Utara - Ferrindo Mandiri Cemerlang | Tokopedia Jual Baffle Plate Ring 6-5/8" Drill Pipe Float Valve 5F6R 5F-6R - Jakarta Utara - Ferrindo Mandiri Cemerlang | Tokopedia](https://images.tokopedia.net/img/cache/700/VqbcmM/2023/2/19/72dbe42c-bbd5-4e7b-a76b-96fb3382c45f.jpg)
Jual Baffle Plate Ring 6-5/8" Drill Pipe Float Valve 5F6R 5F-6R - Jakarta Utara - Ferrindo Mandiri Cemerlang | Tokopedia
![Ring Baffle Plate for Flapper Type Drill Pipe Float Valve (2F3R) - China Valve Products, Valve Manufacturers and Suppliers Ring Baffle Plate for Flapper Type Drill Pipe Float Valve (2F3R) - China Valve Products, Valve Manufacturers and Suppliers](http://www.valveindustry.com/proimages/2f0j00cMHtKsvfnSrW/ring-baffle-plate-for-flapper-type-drill-pipe-float-valve-2f3r-.jpg)
Ring Baffle Plate for Flapper Type Drill Pipe Float Valve (2F3R) - China Valve Products, Valve Manufacturers and Suppliers
![Value Collection - O-Rings; Material: Buna-N; Dash Number: 208; Inside Diameter (Inch): 5/8 in; Inside Diameter (Decimal Inch): 0.6250; Outside Diameter (Inch): 7/8 in; Outside Diameter (Decimal Inch - 75748889 - MSC Industrial Supply Value Collection - O-Rings; Material: Buna-N; Dash Number: 208; Inside Diameter (Inch): 5/8 in; Inside Diameter (Decimal Inch): 0.6250; Outside Diameter (Inch): 7/8 in; Outside Diameter (Decimal Inch - 75748889 - MSC Industrial Supply](https://cdn.mscdirect.com/global/images/ProductImages/7574888AA-24.jpg)