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                                        Casing head 
          Tubing head 
          Tubing bonnet 
          Cross and Tee 
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          Slab gate valve 
          Exp. gate valve 
          Mud gate valve 
          Choke valve 
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                                  Tubing bonnet
          
                                
          
                                  
                                
          
                                
          
                                  
                                
          
                                
          
                                  
          
                                      
          
                                        
          
                                            
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