Doing some maintenance over in the off season. Tore apart the valve and found the plug and gasket assemby in need of being replaced. Its white and appears to be attached to the plug. The gasket was flush with the top of the plug. From the pics online of new ones it appearst to be raised. So new one on the way. The spring and several of the metal washers also have rust on them. Not sure whether this effects the performance? Any other parts I should be takin a peek at while I am in there? Not sure if there is ever a point at which you just buy a whole new valve. I got this one used so I am not sure what the internals should look like new. Thanks for any help.