After reading the posts on the subox mini leaking issues I feel the need to tell everyone one what worked for me. Mine leaked straight away so I washed out my tank including the air chamber and replaced the bottom o-ring and made sure everything was tight.. Every since I have had no problem at all with the leaking I am a stheavy user I take it everywhere I go and have no problem. Just make sure clean everything up because it can still appear to Leak otherwise.. I hope this help reply and let me know