Comparison : Item # 4100-A, Hydraulic Coupling Sockets, Series 4000
Item # 4100, Hydraulic Coupling Sockets, Series 4000
Item # 4300, Hydraulic Coupling Sockets, Series 4000
Item # 4500, Hydraulic Coupling Sockets, Series 4000
Item # 4000-A, Hydraulic Coupling Sockets, Series 4000