Oatey Co. has introduced the Sure-Vent II, the newest of Oatey's air admittance valves, offering a sound alternative to secondary roof vents or vent loops into primary vents. Listed to NSF Standard 14 as complying with ASSE 1051, the Sure-Vent II installs easily in tight places, providing a reliable option with fewer floor and ceiling penetrations. Oatey Co.