The ResMed Mirage Swift II Headgear Buckle is a replacement or backup buckle for your ResMed Mirage Swift II Headgear piece. The Swift's straps and buckles can deteriorate over the life of your mask, so it'll be handy to have backup Headgear Buckles on hand.
You won't need to worry about replacing the buckle until it becomes damaged. If everything is tight and fits well, you probably don't need to worry about your buckle.
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