The Caterpillar Style Flanges are similar to a Code 62 Flange but have an extra thick head which requires a special Cat flange kit (refer to the Cat flange thickness chart in the 'Technical Information Section' of this catalogue). As an alternative, some users simply use our Code 62 fittings and change the flange kit (the bolt holes on Code 62 & Cat line up). Crimp couplings must be installed by a fully trained assembler with appropriate machinery. Always confirm crimp ODs & tolerances. 4S Fittings are used on EC415 (in sizes -12 to -32 Only), EC525 (in sizes -12 to -32 Only), GH493 (in sizes -12 to -32 Only), FC736 (in sizes -12 to -32 Only), FC254 (in sizes -12 to -32 Only), FC500 (sizes -12 to -24), EC600 (in size -12 Only) & EC810 (in sizes -12 to -16 Only).