The Hoek triaxial cells are offered in four models of different size;
each one consists of the following:

• 
  A cell body (1), complete with two quick release self sealing
  couplings, for the introduction of the hydraulic oil and cell pressure,
  and for  air outlet  and saturation of the chamber respectively.
• 
  Two end caps (2), screwed into the cylindrical cell body.
• 
  Upper (3) and lower loading caps (4) with spherical coupling.
• 
  Two female spherical seating (5) connected to the loading caps (3) and
  (4) for the correct transmission of the axial load from the loading
  frame of the compression machine to the specimen.
• 
  A rubber sealing sleeve (6) to separate the specimen from the cell fluid.