Train Control Systems DCC Decoder Harness | 3.5" | All Scales

T-3.5"-21 JST 9-Pin to NEM21 Socket - 3.5" 8.89cm Wires

The T-3.5"-21 is an adapter harness with 3.5" (8.89 cm) wires used for connecting a 9-Pin JST to a 21-Pin motherboard. 9-Pin JST decoders such as the WOW101, T1, and KAT22 may be adapted to interface with NEM660 (21MTC) via this adapter harness