TYPAR Weather Resistant Barriers (WRB) act as air and moisture barriers, while allowing moisture vapor to escape from the wall cavity. Products include . Disclaimer. This project, and all of its results, is only our fault. We (well, Jim K, mostly) paid for everything ourselves, and we did not receive any kind of sponsorship or remuneration from anyone. The 3 inch Gun M5 was an anti-tank gun developed in the United States during World War papilloma-virus.com gun combined a 3-inch ( mm) barrel of the anti-aircraft gun T9 and elements of the mm howitzer M2.