Deck2Wall Spacers promote air circulation and help prevent water and debris from collecting between the house wall and the deck ledger. Made from fiberglass-reinforced polypropylene, the 5/8-inch-thick spacers are 2 1/2 inches in diameter and have an 11/16-inch-diameter hole for a bolt or lag, and three holes for #6 or #8 screws. To install spacers, attach the ledger temporarily, drill the bolt holes, then remove the ledger and attach the spacers. The ledger can then be attached permanently. Test results of connections made with the spacers are available at the company’s website. Decks Unlimited, 888.577.2237, deck2wallspacer.com