The Kadee(R) No. 148 Whisker(R) Metal Coupler will work anywhere a No. 5(R) Coupler will work and is a direct replacement for most Bachmann On30 couplers and a direct replacement for most plastic medium centerset "clone" couplers. This coupler features an all metal coupler head, shank, and Whisker) centering spring. The #148 Magne-Matic Whisker Metal Coupler may be mounted with the included 242 Snap-Together Gearbox or with other manufacturers cast-on coupler pockets. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gearbox to avoid possible electrical crossover and shorting that may cause damage. No.