Kadee Quality Products Kadee #622 Knuckle Springs — For Use With All Kadee Scake Couplers EXCEPT #58 & 711 HO Scale

Knuckle Spring for Standard-Head Couplers (Package of 12) by Kadee Quality products / HO Scale For all Standard Head couplers, except #58, #78, #119, #150-Series, #178, #711, #714 and #2100.