MP08-0218 - Can be permanently installed on your Ducati bevel drive intake manifold to take place of the screw or on other motorcycles that only have a plug in the vacuum port. Eliminates the need to install adapters before every carburetor synchronization - rubber caps are included to seal vacuum. Kit comes with a fibre washer but if you prefer an aluminum crush washer, just choose it in the drop down menu - we highly recommend using an aluminum crush washer for these. Sold EACH so buy 2 for your bevel twin.