Bayshore interior rust and moisture guard.    Slides into place and fits all manufacturers 8" by 10" metal mailboxes.     Flexible arch made of ABS fits neatly and securely into the mailbox and conforms to the mailbox shape when pressed into the bottom corners.  ABS arch is waterproof and highly rugged.      Bottom floor is made of aluminum and fits snuggly onto existing floor and is 20 1/2" in length.    Together the two pieces provide moisture  protection and cover holes in metal where bugs and other creatures may enter the mailbox.     The rust and moisture guard is designed to work perfectly with the RetroFit Mailbox Replacement Door

View YouTube installation video here    

Product has not been tested for all models of plastic mailboxes and is not currently certified for plastic mailboxes