This is the HT100 drag upgrade, which we feel is the best all around washer for the 200/201/250/251 Calcutta's & the DC models as well. It offers a smooth startup, good holding power, and because it is a carbon drag washer, will not heat up and fade like the original....eliminate line jerk when fighting fish! Any ?'s regarding fit, please either Contact Us or see our Schematics Pages Kit conatins 2 drag washers to replace BNT2431 and BNT2433