I have a delta kitchen faucet that needs to be replaced or repaired. I need help is deciding in which to do. It is a one in all type faucet. The sprayer is the type that extends from the water nozzle. I do not know what the model number is, so will it be possible for me to repair it. It probably needs washers and also the gasket has rotted out from under the plate. It is eight years old. Please help me.