Reduction Box Core Plug 63->67. 211-501-249 211501249 Was £12.00 - Now £10.80! inc. VAT (where applicable) Quantity: at £10.80 each Add To Basket Inner core plug found on all large nut rear ends 63-67. This is the coreplug 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.