Crimp couplings must be installed by a fully trained assembler with appropriate machinery. Always confirm crimp ODs & tolerances. 4S STC Fittings are used on GH493 (-06 to -16 only) & FC736 (-06 to -16 only). STC Connector Maximum Pressure Rating: # 06 - 5,000psi, # 08 - 4,250psi, # 10 thru #16 4,000psi