BNLANew Scuba Diving Tank Valve Plug with Fine Threads for Hollis, XS Scuba, Thermo, Diverite & Sea Elite Modular Valves (Left Hand with No Notch) ReviewbP PP NLANew Scuba Diving Tank Valve Plug with Fine Threads for Hollis, XS Scuba, Thermo, Diverite & Sea Elite Modular Valves (Left Hand with No Notch) PConverts your double manifold left hand valve into a single cylinder valve systemPNut does not have small "notches" perpendicular to wrench flats to identify the Left Hand (R) designationPDurable Marine Grade Chrome Brass ConstructionPLeft Handed Configuration with No NotchPComplete with Double O-Ring SealsP