20-Series Coupler medium (9/32") underset shankThese couplers are designed for either Talgo (truck) or body mounting.The 27 Kadee® Magne-Matic® Coupler features a very strong plastic isolated coupler, 634 Centering Spring, (same gear box as the NO.5® Coupler), insulated 232 Draft Gear Box and Lid with side and center screw holes for mounting and the (20-Series draft gear box) insulated 213 Universal Adaptor Plate.The 27 Coupler easily installs in existing Talgo-mounted draft gear boxes with supplied 212 Talgo Truck Adaptors or can be body mounted with supplied 232 draft gear box (NO.5® Draft Gear Box) with side and center screw holes for mounting or with the supplied 213 Universal Adaptor Plate (20-Series draft gear box).