Knott-Avonride coupling head lock, suitable for cast head couplings, complete with 2 keys. This lock fits Knott-Avonride couplings with the lock in the top of the flipper. Also fitted to Ifor Williams trailers with a Knott - Avonride couplings.
Avonride part number SBO35 or 575000. Ifor Williams part number P00302