•  Secure cartridge to valve
• Compatible with Delta R11000 shower diverter valve
• Good build quality and come with solid, clean threads
• Must use a wire brush to clean-up the threads on the valve body & wipe off any grit before install bonnet nut. If clean, nut should turn easily and snug up without excessive force
• Recommend to replace bonnet when replacing cartridge so that you can assure seals are properly seated/compressed in the valve body

RP64851 replacement bonnet nut can be used to secure cartridge to valve,it is a neccesary part for tub and shower faucet.And it has good quality and can be used for a long time.So please make sure to replace bonnet nut when replacing cartridge.