PFister S50-0110 Replacement Bonnet Washer. Pfister takes pride in every single piece, part, and product they develop. Helping them maintain a their reputation and credibility. They take that same pride in creating replacement parts to perform the way they were originally intended too. Rather its for their faucets, showers, or bidets, you can rely on its quality to perform and last. The Pfister S50-0110 Is a Genuine Replacement Stem Washer Kit for Pfister Faucets. This individual Replacement Part does not have a certain finish.