Gasket between the hull and the rubbing plate on the under (water) side of the RS Quest centerboard case. Use on on each side of the case opening. Secured under the rubbing plate using 6x screws. Made of 2000 sail cloth. Also used on the RS Vago, RS Quest, and RS Zest. Part numbers for the rubbing plate and screws are QUE-HF-305 and FIX-S8-C03, respectively.