Feature：
1. 3 life circles for one time grease adding;
2. Advanced body design & emergency sealing system;
3. Excellent casting finish & quality, no welding repair to the body;
4. Special treatment to the plug in order to harden and lubricate the plug surface.
5. Multi-process lapping to carry out the zero leakage without any lubricant for

Standard:
DESIGN & MANUFACTURING:API 6D
Face to Face Dimension: ANSI B 16.10
Flanged End Dimension : ANSI B 16.5
Testing & Inspection: API 598
Fire Safe Design: API 607