This is a Gerber Plumbing replacement ceramic disc faucet cartridge designed for the cold side of compatible faucets It features durable ceramic discs inside a 19mm diameter metal housing for reliable leak free operation This cartridge meets industry standards including NSF 61 for safety and CA AB 1953 for lead content It is a genuine OEM part identified by catalog number 86-986 and model code 163667 for easy replacement.