Seems to be a plastic piece which should be no more than a two dollar replacement part at most.
Hi Unsatisfied Customer, Thank you for your question. Unfortunately the black plastic piece that is part of RP51479SS is not available as a separate item. The valve sleeve will need replaced. If you need warranty parts assistance please call our toll free Homeowner/Warranty line at 1-800-345-3358.
Date published: 2016-10-08