The «wide mouth (0.75 l)» water bottle from SIGG is not recommended to be cleaned in a dishwasher. According to SIGG's FAQs, aggressive cleaning agents in dishwashers can damage the bottle's coating and the inner lining, especially for aluminium bottles. It is advised to wash the bottle by hand to maintain its quality and safety.

Pull the fastener out until you hear a click, then it is fixed in place

I see they are actually identical, the description just says the Wide Mouth is for children and the Sports is for sport/velo.

No

Unfortunately, we cannot supply the closure individually. It's best to ask the manufacturer directly if they can offer you something.

Yes.

According to the manufacturer, this series is made of aluminium.