Screw-type connections at the bottom of the casing head 

A variety of specifications can be processed casing thread, 
Through a short section of dual public connect with the surface casing, 
Installed quickly and conveniently. 

Welded connection at the bottom of the casing head 

   Casing at the scene will be the first to carry out welding and surface casing, casing cover a wide range of specifications. 
Kava ceremony at the bottom of the casing to connect the first 

Using the locking screw tight so that kava fastening 
Surface casing, and thedesign of BT-type casing 
Ring, connecting firmly, convenient and reliable seal.