The unshielded modular RJ couplers from DIGITUS® are available as RJ12, 6P6C or RJ45, 8P8C version. The assignment is "1:1".
DIGITUS RJ45 Modular Coupler, unshielded
Product number: AT-A 8/8
EAN: 4016032066569
CAT 5e Modular Coupler, unshielded RJ45 to RJ45, color white