Through the RWC affiliate, USHP, LLC, Keystone Plus is tailored for use by Mortgage Lenders and Banks combining 3 great components: traditional appliance & systems protection, a thorough home inspection and true structural coverage for existing or resale homes. Financial Institutions looking for a competitive edge for their clients will be able to provide the most coverage at extremely economical pricing. Keystone Plus - The Cornerstone of Protection for the American Dream. Please note: Some warranty, insurance and reporting options may not be available in all states. Check with your local Account Executive for availability in your area.