PFister 940-176D Replacement Knob Diverter . 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 940-176D Is a Genuine replacement Knob Diverter for Pfister-Park Avenue RT6 Roman Tub Faucets. This individual Replacement Part comes in a fine Polished Nickel finish.