The industrial sea water camera company, Hancon, features dry cylinder sleeves that do not directly contact the coolant. Their wall thickness is typically 2-3mm, and both the outer surface and the inner surface of the cylinder sleeve seat are precision machined for necessary positioning accuracy and ease of assembly and disassembly. The advantages of the dry cylinder sleeve design include high body rigidity, small center distance, lightweight, and simple processing technology. However, the drawback is poor thermal conductivity, leading to uneven temperature distribution, which can cause localized deformation.