PLEASE Carefully Check your Valve before ordering... IF You HAVE a Big CONCAVE Groove on your Valve behind the threads this adapter PROBABLY WILL NOT fit on your valve and you should not try to use the threads, because they are for a dust cap. Look instead for my auction for "2" Cam Lock x Garden Hose". You can find all my adapters by looking through my eBay Store
If you have any doubt please ask questions!!! e-mail....Better yet Send me a Picture of your valve! I am willing to take the time to help you determine which adapter is correct for your tank.