The #148 coupler will work anywhere a #5 Coupler will work. The #148 coupler is a direct replacement for most Bachmann On30 couplers and a direct replacement for any plastic Medium Centerset "clone" couplers.
The #148 Kadee Magne-Matic "WHISKER" Coupler features a Metal Coupler, Metal "WHISKER" Centering Spring, insulated Draft Gear Box and Lid. The #148 Coupler may be mounted with supplied #242 draft gear box or with manufactures cast-on coupler pockets. It is not recommended to use a metal coupler directly on a metal surface or in a metal draft gear box to avoid the possible electrical crossover or shorting that may cause damage. Use the provided insulated draft gear box.