Thank you for your question, mike 85! We do not recommend applying lubrication to any parts without specific instructions to do so. All parts that require lubrication will be supplied with instructions or lubricated at the factory. If the hub assembly is starting to get stiff, we would recommend shutting the water supplies off, removing the handle, bonnet, cartridge and hub and checking the hub assembly for mineral buildup. This can be cleaned with a 50/50 solution of white vinegar and water but if the issue persists, the RP44648 O-ring may need replaced. If you need further assistance, please contact us directly.
Best regards, Edward
Date published: 2019-02-19