Reduction Box Core Plug 63->67. 211-501-249 211501249 £15.00 inc. VAT (where applicable) Quantity: at £15.00 each Add To Basket 0 in your basket View Basket Checkout Inner core plug found on all large nut rear ends 63-67. This is the core plug on the inside face of the reduction box. Should always be renewed, but only needs to be removed if leaking, or for replacing the lower shaft. Not the crap plastic everyone else is selling!!