Kadee 634 Centering Spring Kadee HO couplers 5 & 20

#634 Centering Spring Kadee HO couplers 5 & 20 12 pairs Centering Spring for #3(old style), NO.5, 9, 58, #118(old style), 20-Series & 40-Series Couplers. Precision engineered metal Centering Springs for #3 (old style), 5, 9, 20-Series, 40-Series, 58, 118 (old style), 505, 506, 507 and 508 Couplers. One dozen per package